Materiały źródłowe

• #1 Escherichia coli Infection – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK564298/

  Escherichia coli (E. coli) is a gram-negative bacillus that is a causative organism of many diarrheal illnesses, including travelers diarrhea and dysentery. […] This activity reviews the different E. coli strains that cause human illness and describes how to identify and treat these illnesses and highlights the role of the interprofessional team in the care of patients with this condition. […] Review the appropriate evaluation process for Escherichia coli infection. […] Outline the management options available for illnesses caused by Escherichia coli. […] Summary of Treatment […] For patients with extraintestinal illness, culturing blood, urine, or sputum will identify E. coli. […] Antimicrobial therapy directed against E. coli should be based on local antibiograms demonstrating susceptibility and resistance patterns. […] The prognosis of patients who develop extraintestinal infections caused by E. coli is dependent on comorbid conditions.

• #2 E. coli – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/e-coli/symptoms-causes/syc-20372058

  Escherichia coli (E. coli) bacteria normally live in the intestines of healthy people and animals. […] But a few strains, such as E. coli O157:H7, can cause severe stomach cramps, bloody diarrhea and vomiting. […] Healthy adults usually recover from infection with E. coli O157:H7 within a week. […] Signs and symptoms of E. coli O157:H7 infection usually begin three or four days after exposure to the bacteria. […] Contact your doctor if your diarrhea is persistent, severe or bloody. […] Only a few strains of E. coli trigger diarrhea. […] The E. coli O157:H7 strain belongs to a group of E. coli that produces a powerful toxin that damages the lining of the small intestine. […] You develop an E. coli infection when you ingest this strain of bacteria. […] E. coli bacteria can easily travel from person to person, especially when infected adults and children don’t wash their hands properly.

• #3 E. coli: Infection, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16638-e-coli-infection

  Symptoms of an E. coli infection include watery diarrhea, nausea, vomiting, stomach pains, low fever and fatigue. […] An E. coli infection is any illness you get from strains of E. coli bacteria. […] Many strains of E. coli cause mild infections. But some strains, like those that produce Shiga toxin, can cause serious illness, including kidney damage. […] Common types of E. coli infection include gastrointestinal and urinary tract infections (UTIs). […] There are about 265,000 Shiga toxin-producing E. coli (STEC) infections each year in the U.S. STEC is the most common cause of E. coli outbreaks and serious illness from E. coli in the U.S. […] If you have diarrhea or other digestive symptoms, your provider will test a stool (poop) sample for E. coli. […] Specific tests for E. coli include: Stool test, Urinalysis or urine culture, Blood culture, Spinal tap (lumbar puncture).

• #4 E. coli – Diagnosis and treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/e-coli/diagnosis-treatment/drc-20372064

  To diagnose illness caused by E. coli infection, your doctor sends a sample of your stool to a laboratory to test for the presence of E. coli bacteria. The bacteria may be cultured to confirm the diagnosis and identify specific toxins, such as those produced by E. coli O157:H7. […] For an E. coli infection, some basic questions to ask your doctor include: What kinds of tests do I need? […] Your doctor may ask: Are you also having abdominal cramps? […] If you or your child has an E. coli infection, it may be tempting to use an anti-diarrheal medication, but don’t. Diarrhea is one way the body rids itself of toxins. Preventing diarrhea slows that process down.

• #5 Information for Clinicians | E. coli infection | CDC

  https://www.cdc.gov/ecoli/hcp/guidance/index.html

  E. coli infection is diagnosed when the bacteria are identified from the sample of a patient with an acute diarrheal illness. […] Stool samples should be routinely cultured for E. coli O157 and simultaneously assayed for non-O157 STEC with a test that detects Shiga toxins (or the genes that encode them). […] All presumptive E. coli O157 isolates and Shiga toxin-positive specimens should be sent to a public health laboratory for further characterization. […] Rapid, accurate diagnosis of STEC infection is important because early clinical management decisions can affect patient outcomes and early detection can help prevent secondary spread. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC. Public health laboratories typically test for non-STEC E. coli only during an outbreak of diarrheal illness with an unknown origin. […] HUS is diagnosed using standard blood chemistry and blood count tests.

• #6 Escherichia coli (E coli) Infections Workup: Laboratory Studies, Imaging Studies, Procedures

  https://emedicine.medscape.com/article/217485-workup

  All patients with suspected Escherichia coli (E coli) infection should undergo laboratory analysis based on the clinical syndrome suspected. […] Definitive diagnosis is based on the isolation of the organism in the microbiology laboratory from clinical specimens. Specimens may be blood, urine, sputum, or other fluids such as cerebrospinal fluid, pleural fluid, abscesses, and peritoneal fluid. […] Recovery from normally sterile sites, such as the CSF, should be considered diagnostic of infection. […] Lumbar puncture and a CSF culture positive for E coli establish the diagnosis of acute E coli meningitis; however, lumbar puncture is not justified in all babies presenting with sepsis. […] In enteric infections, the causative organism is suggested based on the clinical presentation and the characteristic of the patient’s stool.

• #7 E. coli: Infection, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16638-e-coli-infection

  Symptoms of an E. coli infection include watery diarrhea, nausea, vomiting, stomach pains, low fever and fatigue. […] An E. coli infection is any illness you get from strains of E. coli bacteria. […] Many strains of E. coli cause mild infections. But some strains, like those that produce Shiga toxin, can cause serious illness, including kidney damage. […] Common types of E. coli infection include gastrointestinal and urinary tract infections (UTIs). […] There are about 265,000 Shiga toxin-producing E. coli (STEC) infections each year in the U.S. STEC is the most common cause of E. coli outbreaks and serious illness from E. coli in the U.S. […] If you have diarrhea or other digestive symptoms, your provider will test a stool (poop) sample for E. coli. […] Specific tests for E. coli include: Stool test, Urinalysis or urine culture, Blood culture, Spinal tap (lumbar puncture).

• #8 Information for Clinicians | E. coli infection | CDC

  https://www.cdc.gov/ecoli/hcp/guidance/index.html

  E. coli infection is diagnosed when the bacteria are identified from the sample of a patient with an acute diarrheal illness. […] Stool samples should be routinely cultured for E. coli O157 and simultaneously assayed for non-O157 STEC with a test that detects Shiga toxins (or the genes that encode them). […] All presumptive E. coli O157 isolates and Shiga toxin-positive specimens should be sent to a public health laboratory for further characterization. […] Rapid, accurate diagnosis of STEC infection is important because early clinical management decisions can affect patient outcomes and early detection can help prevent secondary spread. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC. Public health laboratories typically test for non-STEC E. coli only during an outbreak of diarrheal illness with an unknown origin. […] HUS is diagnosed using standard blood chemistry and blood count tests.

• #9 Information for Clinicians | E. coli infection | CDC

  https://www.cdc.gov/ecoli/hcp/guidance/index.html

  E. coli infection is diagnosed when the bacteria are identified from the sample of a patient with an acute diarrheal illness. […] Stool samples should be routinely cultured for E. coli O157 and simultaneously assayed for non-O157 STEC with a test that detects Shiga toxins (or the genes that encode them). […] All presumptive E. coli O157 isolates and Shiga toxin-positive specimens should be sent to a public health laboratory for further characterization. […] Rapid, accurate diagnosis of STEC infection is important because early clinical management decisions can affect patient outcomes and early detection can help prevent secondary spread. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC. Public health laboratories typically test for non-STEC E. coli only during an outbreak of diarrheal illness with an unknown origin. […] HUS is diagnosed using standard blood chemistry and blood count tests.

• #10 Laboratory Testing for E. coli | E. coli infection | CDC

  https://www.cdc.gov/ecoli/php/laboratories/index.html

  Get guidance for detecting Shiga toxin-producing E. coli (STEC). […] Learn about testing for other kinds of diarrheagenic E. coli. […] Recommendations for diagnosis of STEC infections by clinical laboratories. […] Guidance for public health laboratories: Isolation and characterization of STEC from clinical specimens. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC, although some have nucleic acid amplification tests available that can detect enterotoxigenic E. coli (ETEC) and other pathotypes. […] Public health laboratories can perform additional testing for non-STEC pathotypes; however, these labs usually do so only when investigating an outbreak of diarrheal illness of unknown origin. […] CDC offers confirmatory identification, serology, serotyping, subtyping, and virulence profiling for STEC. […] CDC accepts specimens for analysis only from state public health laboratories and other federal agencies.

• #11 Escherichia coli O157:H7 – Wikipedia

  https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7

  Escherichia coli O157:H7is a serotype of the bacterial speciesEscherichia coliand is one of the Shiga-like toxinproducing types ofE. coli. It is a cause of disease, typically foodborne illness, through consumption of contaminated and raw food, including raw milk and undercooked ground beef.[1][2] Infection with this type of pathogenic bacteria may lead to hemorrhagic diarrhea, and to kidney failure; these have been reported to cause the deaths of children younger than five years of age, of elderly patients, and of patients whose immune systems are otherwise compromised. […] A stool culture can detect the bacterium. The sample is cultured on sorbitol-MacConkey (SMAC) agar, or the variant cefixime potassium tellurite sorbitol-MacConkey agar (CT-SMAC[15]). On SMAC agar, O157:H7 colonies appear clear due to their inability to ferment sorbitol, while the colonies of the usual sorbitol-fermenting serotypes of E. coliappear red. Sorbitol non-fermenting colonies are tested for the somatic O157 antigen before being confirmed asE. coliO157:H7. Like all cultures, diagnosis is time-consuming with this method; swifter diagnosis is possible using quickE. coli DNA extraction method[16] plus polymerase chain reaction techniques. Newer technologies using fluorescent and antibody detection are also under development.[citation needed]

• #12 E. coli O157:H7 – Auburn University College of Veterinary Medicine

  https://www.vetmed.auburn.edu/academic-departments/dept-of-pathobiology/diagnostic-services/molecular-diagnostics/e-coli-o157h7/

  E. coli O157:H7 infections are usually diagnosed by isolating the organism from fecal samples or testing the feces for E. coli verotoxin. […] E. coli O157:H7 is not detected in routine cultures but can be recognized by incubation on sorbitol MacConkey agar or the variant cefeximine potassium telluride sorbitol-MacConkey agar. […] However, like all cultures, diagnosis is slow using this method, and more rapid diagnosis is possible using PCR techniques. […] The Molecular Diagnostics Laboratory at Auburn University has developed a quantitative PCR technology targeting the eaegene, avirulence marker for the attachment and effacement present only in E. coli O157:H7. […] The PCR is designed and capable of detecting a single copy of this target gene in the PCR nucleic acid input.

• #13 Information for Clinicians | E. coli infection | CDC

  https://www.cdc.gov/ecoli/hcp/guidance/index.html

  E. coli infection is diagnosed when the bacteria are identified from the sample of a patient with an acute diarrheal illness. […] Stool samples should be routinely cultured for E. coli O157 and simultaneously assayed for non-O157 STEC with a test that detects Shiga toxins (or the genes that encode them). […] All presumptive E. coli O157 isolates and Shiga toxin-positive specimens should be sent to a public health laboratory for further characterization. […] Rapid, accurate diagnosis of STEC infection is important because early clinical management decisions can affect patient outcomes and early detection can help prevent secondary spread. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC. Public health laboratories typically test for non-STEC E. coli only during an outbreak of diarrheal illness with an unknown origin. […] HUS is diagnosed using standard blood chemistry and blood count tests.

• #14 Laboratory Testing for E. coli | E. coli infection | CDC

  https://www.cdc.gov/ecoli/php/laboratories/index.html

  Get guidance for detecting Shiga toxin-producing E. coli (STEC). […] Learn about testing for other kinds of diarrheagenic E. coli. […] Recommendations for diagnosis of STEC infections by clinical laboratories. […] Guidance for public health laboratories: Isolation and characterization of STEC from clinical specimens. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC, although some have nucleic acid amplification tests available that can detect enterotoxigenic E. coli (ETEC) and other pathotypes. […] Public health laboratories can perform additional testing for non-STEC pathotypes; however, these labs usually do so only when investigating an outbreak of diarrheal illness of unknown origin. […] CDC offers confirmatory identification, serology, serotyping, subtyping, and virulence profiling for STEC. […] CDC accepts specimens for analysis only from state public health laboratories and other federal agencies.

• #15 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Identification of non-O157 STEC typically occurs at the public health laboratory and not at clinical laboratories. […] However, this section includes the basic techniques for reference. […] Nonculture assays that detect the Shiga toxins produced by STEC (e.g., the Shiga toxin EIA) were first introduced in the United States in 1995. […] The primary advantage of nonculture assays for Shiga toxin is that they can be used to detect all serotypes of STEC. […] The Center for Devices and Radiological Health of the Food and Drug Administration (FDA) has approved several immunoassays for the detection of Shiga toxin in human specimens. […] Because the amount of free fecal Shiga toxin in stools is often low, EIA testing of enrichment broth cultures incubated overnight (16–24 hours at 37C [99F]), rather than direct testing of stool specimens, is recommended.

• #16 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Laboratories should immediately report Shiga toxin–positive specimens to the treating clinician and appropriate public health and infection control officials. […] Clinical laboratories should forward Shiga toxin–positive specimens or enrichment broths to a public health laboratory as soon as possible for isolation and additional characterization. […] In multiple studies, for reasons that are unknown, EIAs failed to detect a subset of O157 STEC that were readily identified on simultaneously plated SMAC agar, underscoring the importance of primary isolation. […] EIA tests also might have false-positive STEC results when other pathogens are present. […] PCR assays to detect the stx1 and stx2 genes are used by many public health laboratories for diagnosis and confirmation of STEC infection. […] Depending on the primers used, these assays can distinguish between stx1 and stx2.

• #17 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Most PCR assays are designed and validated for testing isolated colonies taken from plated media; some assays have been validated for testing on stool specimens subcultured to an enrichment broth and incubated for 18–24 hours. […] Shiga toxin PCR assays on DNA extracted from whole stool specimens are not recommended because the sensitivity is low. […] One commercial immunoassay is available to test for the O157 and H7 antigens in human stools and stool cultures. […] This rapid assay may be performed either directly on stools or on an enrichment broth culture incubated overnight (16–24 hours at 37C [99F]). […] The Vero (African green monkey kidney) and HeLa cell lines are very sensitive to Shiga toxin because they have high concentrations of globotriaosylceramides Gb3 and Gb4, the receptors for Shiga toxin in eukaryotic cells. […] Confirmation that the cytopathic effect is caused by Shiga toxin is performed by neutralization using anti-Stx 1 and anti-Stx 2 antibodies.

• #18 E. coli Infection: Signs, Symptoms, Contagious, Treatments & Causes

  https://www.emedicinehealth.com/e_coli_escherichia_coli_0157h7_e_coli_0157h7/article_em.htm

  Is There a Test for E. coli? How Is It Diagnosed? […] The diagnosis is usually made by an accurate history, physical exam, and analysis of the fecal sample. A presumptive diagnosis is made if the patient’s history indicates an association with persons, foods, or fluids known to contain E. coli 0157:H7. Such a presumptive diagnosis is often made during outbreaks of the disease. […] Culture of E. coli 0157:H7 from a fecal specimen on selective media (sorbitol-MacConkey agar) gives a definitive diagnosis of the infection when clear-appearing colonies react with 0157 antiserum. Other tests may include an oxidase test, PCR and immunofluorescence tests. The CDC has recommended that all patients being evaluated for community-acquired diarrhea should have their stool samples analyzed by immunologic test systems that detect all types of Shiga toxins as this test will likely detect almost all bacteria that produce Shiga toxins, especially the E. coli 0157:H7 strains. The CDC suggests that this test is even better than bacterial culture techniques, but recommends that both culture and immunologic tests should be done at the same time.

• #19 Escherichia coli (E coli) Infections Workup: Laboratory Studies, Imaging Studies, Procedures

  https://emedicine.medscape.com/article/217485-workup

  All patients with suspected Escherichia coli (E coli) infection should undergo laboratory analysis based on the clinical syndrome suspected. […] Definitive diagnosis is based on the isolation of the organism in the microbiology laboratory from clinical specimens. Specimens may be blood, urine, sputum, or other fluids such as cerebrospinal fluid, pleural fluid, abscesses, and peritoneal fluid. […] Recovery from normally sterile sites, such as the CSF, should be considered diagnostic of infection. […] Lumbar puncture and a CSF culture positive for E coli establish the diagnosis of acute E coli meningitis; however, lumbar puncture is not justified in all babies presenting with sepsis. […] In enteric infections, the causative organism is suggested based on the clinical presentation and the characteristic of the patient’s stool.

• #20 Escherichia coli: Properties and Identification • Microbe Online

  https://microbeonline.com/e-coli-disease-properties-pathogenesis-and-laboratory-diagnosis/

  E. coli is the most common cause of both community and nosocomial urinary tract infections; E. coli causes more than 75% of cases of UTI. […] Enterotoxigenic Escherichia coli (ETEC) is responsible for the travelers diarrhea (watery diarrhea). […] Enterohemorrhagic strains of E. coli (i.e., shiga toxin-STx producing E. coli) cause bloody diarrhea and hemolytic uremic syndrome (HUS). […] E. coli ferments lactose and produces pink colonies on MacConkey Agar. Typical colonies of Escherichia coli on MacConkey agar will appear pink and shiny and have a diameter of 0.5 to 1 mm after overnight incubation. […] Perform the susceptibility test by a disc-diffusion method using standard methods described in the guidelines. […] To detect ESBL-producing E. coli, the isolate screened should be multidrug-resistant exhibiting resistance to at least one of the third-generation cephalosporins.

• #21 Escherichia coli: Properties and Identification • Microbe Online

  https://microbeonline.com/e-coli-disease-properties-pathogenesis-and-laboratory-diagnosis/

  E. coli is the most common cause of both community and nosocomial urinary tract infections; E. coli causes more than 75% of cases of UTI. […] Enterotoxigenic Escherichia coli (ETEC) is responsible for the travelers diarrhea (watery diarrhea). […] Enterohemorrhagic strains of E. coli (i.e., shiga toxin-STx producing E. coli) cause bloody diarrhea and hemolytic uremic syndrome (HUS). […] E. coli ferments lactose and produces pink colonies on MacConkey Agar. Typical colonies of Escherichia coli on MacConkey agar will appear pink and shiny and have a diameter of 0.5 to 1 mm after overnight incubation. […] Perform the susceptibility test by a disc-diffusion method using standard methods described in the guidelines. […] To detect ESBL-producing E. coli, the isolate screened should be multidrug-resistant exhibiting resistance to at least one of the third-generation cephalosporins.

• #22 Escherichia coli: Properties and Identification • Microbe Online

  https://microbeonline.com/e-coli-disease-properties-pathogenesis-and-laboratory-diagnosis/

  According to the CLSI guidelines, isolates showing an inhibition zone size of 22 mm with ceftazidime (30 g), 25 mm with ceftriaxone (30 g), and 27 mm with cefotaxime (30 g) are identified as potential ESBL producers and shortlisted for confirmation of ESBL production. […] Uropathogenic Escherichia coli (UPEC) strains cause 70 to 90% of community-acquired urinary tract infections (UTIs) in an estimated 150 million individuals annually and about 40% of all nosocomial UTIs. […] Compared to commensal E. coli, uropathogenic E. coli are better adapted to the urethra and cause a greater proportion of UTIs. The more virulence factors a strain expresses, the more severe infection it can cause.

• #23 Escherichia coli: Properties and Identification • Microbe Online

  https://microbeonline.com/e-coli-disease-properties-pathogenesis-and-laboratory-diagnosis/

  According to the CLSI guidelines, isolates showing an inhibition zone size of 22 mm with ceftazidime (30 g), 25 mm with ceftriaxone (30 g), and 27 mm with cefotaxime (30 g) are identified as potential ESBL producers and shortlisted for confirmation of ESBL production. […] Uropathogenic Escherichia coli (UPEC) strains cause 70 to 90% of community-acquired urinary tract infections (UTIs) in an estimated 150 million individuals annually and about 40% of all nosocomial UTIs. […] Compared to commensal E. coli, uropathogenic E. coli are better adapted to the urethra and cause a greater proportion of UTIs. The more virulence factors a strain expresses, the more severe infection it can cause.

• #24 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  Developing countries due to socio-economic conditions are more prone to frequent pathogenic outbreaks; inadequate sanitation and water quality monitoring are also responsible for such conditions. Therefore, it is of paramount importance to provide microbiologically safe food/water in order to protect public health. […] Molecular identification of water contaminants, mainly Escherichia coli, has been extensively used. Several of the molecular-based techniques are based on amplification and detection of nucleic acids. The advantages offered by these PCR-based methods over culture-based techniques are a higher level of specificity, sensitivity, and rapidity. […] This review seeks to provide a vista of the progress made in the detection of E. coli using nucleic acid-based approaches as part of the microbiological food/water quality monitoring.

• #25 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  Public health protection is of paramount importance that demands the rapid and accurate detection and quantitation of microorganisms in potable water and in various raw and processed foods to prevent undesirable outbreaks of microbial contamination. […] Amongst coliform bacteria, E. coli is commonly regarded as an indicator of fecal pollution of water supplies. […] It is necessary to develop new approaches for detecting E. coli in contaminating food and water samples. Optical or impedimetric biosensor systems have evolved as an alternative to the traditional tools for E. coli detection, enabling selective, specific, and cost-effective solutions. […] DNA-based sensing approaches have played an essential role in the development of sensing for the detection of E. coli. […] The advantage of PCR is that despite its inability to distinguish between live and dead cells, nonculturable cells may be detected rapidly.

• #26 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  The uidA and tuf genes have been identified as potential targets for E. coli/Shigella detection using PCR. […] In developing countries, the identification of enteric pathogens in food and other edible items are time-consuming process and often results in wrong and delayed diagnosis. […] Thus, mPCR methodology permitted differentiation of EPEC, STEC, and EHEC strains from other pathogenic E. coli and the developed assay has the potential tool for rapid diagnosis of these pathogens. […] Detection of harmful bacteria with higher specificity, sensitivity, and reliability is the focus of nucleic acid-based approaches. […] Molecular diagnostic platforms have become promising alternatives to traditional methods for E. coli detection. In particular, LAMP assay and DNA biosensors because of their advantages of lower detection limits, and high reproducibility are preferred for pathogen detection. […] Nonetheless, CRISPR/Cas sensing platforms possess the potential to overcome the use of conventional molecular diagnostic platforms and become a promising tool for next-generation diagnostic platforms for sensitive and selective detection of DNA in clinical, food, and environmental samples.

• #27 Escherichia coli Infections – Infections – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/infections/bacterial-infections-gram-negative-bacteria/escherichia-coli-infections

  Symptoms of E. coli infections depend on the part of the body affected and on the strain of E. coli causing the infection. […] Diagnosis of E. coli infections involves culture of samples of urine, stool, or other infected material. Samples of blood, stool, urine, or other infected material are taken and sent to a laboratory to grow (culture) the bacteria. Identifying the bacteria in the sample confirms the diagnosis. […] If E. coli O157:H7 is suspected, doctors culture and test stool for Shiga toxins, which are produced by these bacteria. This test provides results quickly. […] Treatment of E. coli infection varies depending on where the infection is, how severe it is, and which type of E. coli is causing it. […] For many infections, antibiotics are used. […] For diarrhea due to E. coli O157:H7, fluids are given.

• #28 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  Public health protection is of paramount importance that demands the rapid and accurate detection and quantitation of microorganisms in potable water and in various raw and processed foods to prevent undesirable outbreaks of microbial contamination. […] Amongst coliform bacteria, E. coli is commonly regarded as an indicator of fecal pollution of water supplies. […] It is necessary to develop new approaches for detecting E. coli in contaminating food and water samples. Optical or impedimetric biosensor systems have evolved as an alternative to the traditional tools for E. coli detection, enabling selective, specific, and cost-effective solutions. […] DNA-based sensing approaches have played an essential role in the development of sensing for the detection of E. coli. […] The advantage of PCR is that despite its inability to distinguish between live and dead cells, nonculturable cells may be detected rapidly.

• #29 Predictive Diagnostics for Escherichia coli Infections Based on the Clonal Association of Antimicrobial Resistance and Clinical Outcome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3754640/

  The ability to identify bacterial pathogens at the subspecies level in clinical diagnostics is currently limited. […] We investigated whether splitting Escherichia coli species into clonal groups (clonotypes) predicts antimicrobial susceptibility or clinical outcome. […] Clonotype-guided antimicrobial selection significantly reduced drug-bug mismatch compared to that which occurs with the use of conventional empirical therapy. […] In E. coli, subspecies-level identification by clonotyping can be used to significantly improve empirical predictions of antimicrobial susceptibility and clinical outcomes in a timely manner. […] Bacterial species identification is essential for the correct diagnosis of disease and to optimize the empirical choice of antimicrobial treatment before the results of culturing and susceptibility testing are available.

• #30 Predictive Diagnostics for Escherichia coli Infections Based on the Clonal Association of Antimicrobial Resistance and Clinical Outcome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3754640/

  Escherichia coli is a leading extraintestinal pathogen in the United States, causing millions of infections and tens of thousands of deaths each year. […] The use of clonotyping as a general predictive marker for antimicrobial susceptibility among unselected extraintestinal clinical E. coli isolates has not been reported. […] We show that the clonal identities of clinical E. coli isolates, as inferred from two universal loci (fumC and fimH), are linked to distinct antimicrobial susceptibility profiles and clinical manifestations. […] Clonotyping can be done on the primary specimen well before species-level identification by growth on selective media and susceptibility profile determination, which typically has 2- to 3-day lag time. […] Our findings indicate that a clonotype-guided approach might substantially reduce the likelihood of drug-bug mismatches during the course of initial antimicrobial therapy by providing more specific data about a patient’s actual organism.

• #31 Escherichia coli: Properties and Identification • Microbe Online

  https://microbeonline.com/e-coli-disease-properties-pathogenesis-and-laboratory-diagnosis/

  According to the CLSI guidelines, isolates showing an inhibition zone size of 22 mm with ceftazidime (30 g), 25 mm with ceftriaxone (30 g), and 27 mm with cefotaxime (30 g) are identified as potential ESBL producers and shortlisted for confirmation of ESBL production. […] Uropathogenic Escherichia coli (UPEC) strains cause 70 to 90% of community-acquired urinary tract infections (UTIs) in an estimated 150 million individuals annually and about 40% of all nosocomial UTIs. […] Compared to commensal E. coli, uropathogenic E. coli are better adapted to the urethra and cause a greater proportion of UTIs. The more virulence factors a strain expresses, the more severe infection it can cause.

• #32 E. coli Bacteria Infection: Symptoms, Treatment and Prevention

  https://www.webmd.com/food-recipes/food-poisoning/what-is-e-coli

  E. coli in Urine: Eighty percent to 90% of urinary tract infections (UTIs) are caused by E. coli bacteria, says the National Kidney Foundation. Women are much more likely to get UTIs than men because their urethra (the tube that takes urine from your bladder out your body) is shorter, which makes it easier for bacteria to travel from your butt to your bladder if you don’t wipe yourself properly. […] The only way your doctor can know for sure if you have an E. coli infection is to send a sample of your stool to a lab to be analyzed. […] If you have fever or bloody diarrhea or if your doctor suspects Shiga toxin-producing E. coli, don’t take antibiotics. They can actually increase the production of Shiga toxin and worsen your symptoms. […] Healthy people infected with E. coli usually feel better within a week. But some people have a serious complication called hemolytic uremic syndrome, which affects the kidneys. This is more likely to happen to older people and children. […] Most types of E. coli bacteria aren’t dangerous, but a few are harmful. The EHEC/STEC type is responsible for most E. coli infections that cause diarrhea in people.

• #33 Escherichia coli (E coli) Infections Workup: Laboratory Studies, Imaging Studies, Procedures

  https://emedicine.medscape.com/article/217485-workup

  If available, a diarrhea panel polymerase chain reaction (PCR) test on stool can assist in discriminating between the different types of E coli. […] Definitive diagnosis is based on urine culture results, with a normal individual requiring 100,000 colony forming units (CFUs) of bacteria to be considered an infection, whereas this number is less in a catheterized patient. […] Recognize longstanding Foley catheters may have colonization and may not represent a true infection.

• #34 E coli lab types and laboratory diagnosis | PPT

  https://www.slideshare.net/slideshow/e-coli-lab-types-and-laboratory-diagnosis/86462437

  Laboratory diagnosis involves examining samples under a microscope, culturing on blood and MacConkey agar to observe colony morphology and color, and conducting biochemical tests like catalase, oxidase, and API tests. […] Laboratory diagnosis of UTIs involves collecting a urine sample and testing for significant bacteriuria, typically over 104 colony forming units per mL. Urine culture and sensitivity testing can identify the causative organism and determine appropriate antibiotic treatment. […] Identification of Enterobacteriaceae involves examining biochemical reactions and growth on selective media like MacConkey agar.

• #35 Escherichia coli (E coli) Infections Workup: Laboratory Studies, Imaging Studies, Procedures

  https://emedicine.medscape.com/article/217485-workup

  If available, a diarrhea panel polymerase chain reaction (PCR) test on stool can assist in discriminating between the different types of E coli. […] Definitive diagnosis is based on urine culture results, with a normal individual requiring 100,000 colony forming units (CFUs) of bacteria to be considered an infection, whereas this number is less in a catheterized patient. […] Recognize longstanding Foley catheters may have colonization and may not represent a true infection.

• #36 E. coli Gastroenteritis – Gastrointestinal Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/gastrointestinal-disorders/gastroenteritis/e-coli-gastroenteritis

  Several different subtypes of Escherichia coli cause diarrhea. […] When needed, organism-specific diagnosis can be made by polymerase chain reaction testing of stool. […] Stool studies for a bacterial cause are indicated in patients with bloody or heme-positive stool, fever, moderate to severe diarrhea, or diarrhea lasting more than 7 days, in those 70 years old or older, or in those with inflammatory bowel disease or immunocompromising disorders such as HIV/AIDS. […] A rapid stool assay for Shiga toxin or, when available, a test for the gene that encodes the toxin may be helpful. […] Each of the E. coli subtypes can be detected in stool by polymerase chain reaction (PCR) testing, typically using a multiplex PCR panel. […] Stool testing is not needed routinely, but if an enterohemorrhagic strain is suspected, a rapid stool assay for Shiga toxin or gene-based testing should be done. […] Antibiotics are generally not needed and can increase the risk of hemolytic-uremic syndrome when Shiga toxin-producing strains are involved. […] Antidiarrheal agents are safe for adults with watery diarrhea but should be avoided in children.

• #37 E. coli Bacteria Infection: Symptoms, Treatment and Prevention

  https://www.webmd.com/food-recipes/food-poisoning/what-is-e-coli

  E. coli in Urine: Eighty percent to 90% of urinary tract infections (UTIs) are caused by E. coli bacteria, says the National Kidney Foundation. Women are much more likely to get UTIs than men because their urethra (the tube that takes urine from your bladder out your body) is shorter, which makes it easier for bacteria to travel from your butt to your bladder if you don’t wipe yourself properly. […] The only way your doctor can know for sure if you have an E. coli infection is to send a sample of your stool to a lab to be analyzed. […] If you have fever or bloody diarrhea or if your doctor suspects Shiga toxin-producing E. coli, don’t take antibiotics. They can actually increase the production of Shiga toxin and worsen your symptoms. […] Healthy people infected with E. coli usually feel better within a week. But some people have a serious complication called hemolytic uremic syndrome, which affects the kidneys. This is more likely to happen to older people and children. […] Most types of E. coli bacteria aren’t dangerous, but a few are harmful. The EHEC/STEC type is responsible for most E. coli infections that cause diarrhea in people.

• #38 E. coli Gastroenteritis – Gastrointestinal Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/gastrointestinal-disorders/gastroenteritis/e-coli-gastroenteritis

  Several different subtypes of Escherichia coli cause diarrhea. […] When needed, organism-specific diagnosis can be made by polymerase chain reaction testing of stool. […] Stool studies for a bacterial cause are indicated in patients with bloody or heme-positive stool, fever, moderate to severe diarrhea, or diarrhea lasting more than 7 days, in those 70 years old or older, or in those with inflammatory bowel disease or immunocompromising disorders such as HIV/AIDS. […] A rapid stool assay for Shiga toxin or, when available, a test for the gene that encodes the toxin may be helpful. […] Each of the E. coli subtypes can be detected in stool by polymerase chain reaction (PCR) testing, typically using a multiplex PCR panel. […] Stool testing is not needed routinely, but if an enterohemorrhagic strain is suspected, a rapid stool assay for Shiga toxin or gene-based testing should be done. […] Antibiotics are generally not needed and can increase the risk of hemolytic-uremic syndrome when Shiga toxin-producing strains are involved. […] Antidiarrheal agents are safe for adults with watery diarrhea but should be avoided in children.

• #39 E. coli Gastroenteritis – Gastrointestinal Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/gastrointestinal-disorders/gastroenteritis/e-coli-gastroenteritis

  Several different subtypes of Escherichia coli cause diarrhea. […] When needed, organism-specific diagnosis can be made by polymerase chain reaction testing of stool. […] Stool studies for a bacterial cause are indicated in patients with bloody or heme-positive stool, fever, moderate to severe diarrhea, or diarrhea lasting more than 7 days, in those 70 years old or older, or in those with inflammatory bowel disease or immunocompromising disorders such as HIV/AIDS. […] A rapid stool assay for Shiga toxin or, when available, a test for the gene that encodes the toxin may be helpful. […] Each of the E. coli subtypes can be detected in stool by polymerase chain reaction (PCR) testing, typically using a multiplex PCR panel. […] Stool testing is not needed routinely, but if an enterohemorrhagic strain is suspected, a rapid stool assay for Shiga toxin or gene-based testing should be done. […] Antibiotics are generally not needed and can increase the risk of hemolytic-uremic syndrome when Shiga toxin-producing strains are involved. […] Antidiarrheal agents are safe for adults with watery diarrhea but should be avoided in children.

• #40 Information for Clinicians | E. coli infection | CDC

  https://www.cdc.gov/ecoli/hcp/guidance/index.html

  E. coli infection is diagnosed when the bacteria are identified from the sample of a patient with an acute diarrheal illness. […] Stool samples should be routinely cultured for E. coli O157 and simultaneously assayed for non-O157 STEC with a test that detects Shiga toxins (or the genes that encode them). […] All presumptive E. coli O157 isolates and Shiga toxin-positive specimens should be sent to a public health laboratory for further characterization. […] Rapid, accurate diagnosis of STEC infection is important because early clinical management decisions can affect patient outcomes and early detection can help prevent secondary spread. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC. Public health laboratories typically test for non-STEC E. coli only during an outbreak of diarrheal illness with an unknown origin. […] HUS is diagnosed using standard blood chemistry and blood count tests.

• #41 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Shiga toxin–producing Escherichia coli (STEC) are a leading cause of bacterial enteric infections in the United States. Prompt, accurate diagnosis of STEC infection is important because appropriate treatment early in the course of infection might decrease the risk for serious complications such as renal damage and improve overall patient outcome. […] In addition, prompt laboratory identification of STEC strains is essential for detecting new and emerging serotypes, for effective and timely outbreak responses and control measures, and for monitoring trends in disease epidemiology. […] Guidelines for laboratory identification of STEC infections by clinical laboratories were published in 2006. This report provides comprehensive and detailed recommendations for STEC testing by clinical laboratories, including the recommendation that all stools submitted for routine testing from patients with acute community-acquired diarrhea (regardless of patient age, season of the year, or presence or absence of blood in the stool) be simultaneously cultured for E. coli O157:H7 (O157 STEC) and tested with an assay that detects Shiga toxins to detect non-O157 STEC. […] Improving the diagnostic accuracy of STEC infection by clinical laboratories should ensure prompt diagnosis and treatment of these infections in patients and increase detection of STEC outbreaks in the community.

• #42 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Prompt and accurate diagnosis of STEC infection is important because appropriate treatment with parenteral volume expansion early in the course of infection might decrease renal damage and improve patient outcome. […] In addition, because antibiotic therapy in patients with STEC infections might be associated with more severe disease, prompt diagnosis is needed to ensure proper treatment. Furthermore, prompt laboratory identification of STEC strains is essential for implementation of control measures, for effective and timely outbreak responses, to detect new and emerging serotypes, and to monitor trends in disease epidemiology. […] Most O157 STEC isolates can be readily identified in the laboratory when grown on sorbitol-containing selective media because O157 STEC cannot ferment sorbitol within 24 hours. However, many clinical laboratories do not routinely culture stool specimens for O157 STEC. […] Recently, the increased use of enzyme immunoassay (EIA) or polymerase chain reaction (PCR) to detect Shiga toxin or the genes that encode the toxins (stx1 and stx2) has facilitated the diagnosis of both O157 and non-O157 STEC infections.

• #43 Diagnosis and Treatment for Shiga Toxin-Producing Escherichia coli Associated Hemolytic Uremic Syndrome

  https://www.mdpi.com/2072-6651/15/1/10

  Shiga toxin-producing Escherichia coli (STEC)-associated hemolytic uremic syndrome (STEC-HUS) is a clinical syndrome involving hemolytic anemia (with fragmented red blood cells), low levels of platelets in the blood (thrombocytopenia), and acute kidney injury (AKI). […] Early diagnosis is of great significance for improving prognosis and reducing mortality and sequelae. In this review, we first briefly summarize the diagnostics for STEC-HUS, including history taking, clinical manifestations, fecal and serological detection methods for STEC, and complement activation monitoring. […] Clinically, the diagnosis of STEC-HUS mainly relies on prior potential infections or exposure history, corresponding clinical symptoms, and auxiliary examinations that indicate thrombotic microangiopathy, such as nonimmune hemolytic anemia (hematocrit < 30%, with fragmented erythrocytes in peripheral blood smear and a negative Coombs test), thrombocytopenia (platelet count < 150,000 mm³), and abnormal renal function (a serum creatinine concentration that exceeds the upper limit of the reference range for age) with or without hypocomplementemia.

• #44 E. coli – Diagnosis and treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/e-coli/diagnosis-treatment/drc-20372064

  To diagnose illness caused by E. coli infection, your doctor sends a sample of your stool to a laboratory to test for the presence of E. coli bacteria. The bacteria may be cultured to confirm the diagnosis and identify specific toxins, such as those produced by E. coli O157:H7. […] For an E. coli infection, some basic questions to ask your doctor include: What kinds of tests do I need? […] Your doctor may ask: Are you also having abdominal cramps? […] If you or your child has an E. coli infection, it may be tempting to use an anti-diarrheal medication, but don’t. Diarrhea is one way the body rids itself of toxins. Preventing diarrhea slows that process down.

• #45 E. coli: Infection, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16638-e-coli-infection

  Healthcare providers specifically dont treat STEC with antibiotics or antidiarrheal medicines. […] But if you have another type of E. coli infection like a UTI, meningitis or sepsis or if your symptoms are severe, your provider will treat you with antibiotics. […] The most important thing you can do to protect against E. coli infections is to wash your hands. […] E. coli infections can cause everything from brief bouts of diarrhea to life-threatening illness. […] Most people recover on their own or with antibiotic treatment. […] Yes, E. coli infections can be deadly. […] See a healthcare provider if you have diarrhea for more than three days, symptoms of a UTI or other health concerns.

• #46 E. coli Enteritis: Causes, Symptoms & Diagnosis

  https://www.healthline.com/health/e-coli-enteritis

  Your doctor will perform a physical examination and ask you questions about your symptoms. To confirm a diagnosis, your doctor will order a stool culture to test for the presence of disease-causing E. coli. […] Though antibiotics are often prescribed to treat bacterial infections, theres no evidence that antibiotics are effective in treating E. coli. In fact, antibiotics can increase the risk of hemolytic uremia in the case of certain bacterial strains.

• #47 Escherichia coli Infections – Infections – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/infections/bacterial-infections-gram-negative-bacteria/escherichia-coli-infections

  Many other E. coli infections, usually bladder or other urinary tract infections, are treated with antibiotics, such as trimethoprim/sulfamethoxazole, nitrofurantoin, or a fluoroquinolone. However, many bacteria, particularly those acquired in a health care facility, are resistant to some antibiotics. […] Prevention of E. coli infections involves avoiding unpasteurized milk and other dairy products made from unpasteurized milk, thoroughly cooking beef, and thoroughly washing the hands with soap and running water after using the toilet, changing diapers, and having contact with animals or their environment and before and after preparing or eating food.

• #48 Information for Clinicians | E. coli infection | CDC

  https://www.cdc.gov/ecoli/hcp/guidance/index.html

  E. coli infection is diagnosed when the bacteria are identified from the sample of a patient with an acute diarrheal illness. […] Stool samples should be routinely cultured for E. coli O157 and simultaneously assayed for non-O157 STEC with a test that detects Shiga toxins (or the genes that encode them). […] All presumptive E. coli O157 isolates and Shiga toxin-positive specimens should be sent to a public health laboratory for further characterization. […] Rapid, accurate diagnosis of STEC infection is important because early clinical management decisions can affect patient outcomes and early detection can help prevent secondary spread. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC. Public health laboratories typically test for non-STEC E. coli only during an outbreak of diarrheal illness with an unknown origin. […] HUS is diagnosed using standard blood chemistry and blood count tests.

• #49 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Prompt laboratory diagnosis of STEC infection facilitates rapid subtyping of STEC isolates by public health laboratories and submission of PFGE patterns to PulseNet, the national molecular subtyping network for foodborne disease surveillance. […] Rapid laboratory diagnosis and subtyping of STEC isolates leads to prompt detection of outbreaks, timely public health actions, and detection of emerging STEC strains. […] All stool specimens from patients with acute onset of community-acquired diarrhea and from patients with possible HUS should be tested for STEC. […] Many infections are missed with selective STEC testing strategies (e.g., testing only specimens from children, testing only during summer months, or testing only stools with white blood cells or blood). […] To prevent additional transmission of infection, certain persons (e.g., food-service workers and children who attend child-care facilities or adults who work in these facilities) who receive a diagnosis of STEC infection might be required by state law or a specific facility to prove that they are no longer shedding the bacteria after treatment and before returning to the particular setting.

• #50 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Laboratories should immediately report Shiga toxin–positive specimens to the treating clinician and appropriate public health and infection control officials. […] Clinical laboratories should forward Shiga toxin–positive specimens or enrichment broths to a public health laboratory as soon as possible for isolation and additional characterization. […] In multiple studies, for reasons that are unknown, EIAs failed to detect a subset of O157 STEC that were readily identified on simultaneously plated SMAC agar, underscoring the importance of primary isolation. […] EIA tests also might have false-positive STEC results when other pathogens are present. […] PCR assays to detect the stx1 and stx2 genes are used by many public health laboratories for diagnosis and confirmation of STEC infection. […] Depending on the primers used, these assays can distinguish between stx1 and stx2.

• #51 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Prompt laboratory diagnosis of STEC infection facilitates rapid subtyping of STEC isolates by public health laboratories and submission of PFGE patterns to PulseNet, the national molecular subtyping network for foodborne disease surveillance. […] Rapid laboratory diagnosis and subtyping of STEC isolates leads to prompt detection of outbreaks, timely public health actions, and detection of emerging STEC strains. […] All stool specimens from patients with acute onset of community-acquired diarrhea and from patients with possible HUS should be tested for STEC. […] Many infections are missed with selective STEC testing strategies (e.g., testing only specimens from children, testing only during summer months, or testing only stools with white blood cells or blood). […] To prevent additional transmission of infection, certain persons (e.g., food-service workers and children who attend child-care facilities or adults who work in these facilities) who receive a diagnosis of STEC infection might be required by state law or a specific facility to prove that they are no longer shedding the bacteria after treatment and before returning to the particular setting.

• #52 Laboratory Testing for E. coli | E. coli infection | CDC

  https://www.cdc.gov/ecoli/php/laboratories/index.html

  Get guidance for detecting Shiga toxin-producing E. coli (STEC). […] Learn about testing for other kinds of diarrheagenic E. coli. […] Recommendations for diagnosis of STEC infections by clinical laboratories. […] Guidance for public health laboratories: Isolation and characterization of STEC from clinical specimens. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC, although some have nucleic acid amplification tests available that can detect enterotoxigenic E. coli (ETEC) and other pathotypes. […] Public health laboratories can perform additional testing for non-STEC pathotypes; however, these labs usually do so only when investigating an outbreak of diarrheal illness of unknown origin. […] CDC offers confirmatory identification, serology, serotyping, subtyping, and virulence profiling for STEC. […] CDC accepts specimens for analysis only from state public health laboratories and other federal agencies.

• #53 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  All stools submitted for testing from patients with acute community-acquired diarrhea (i.e., for detection of the enteric pathogens Salmonella, Shigella, and Campylobacter) should be cultured for O157 STEC on selective and differential agar. […] These stools should be simultaneously assayed for non-O157 STEC with a test that detects the Shiga toxins or the genes encoding these toxins. […] Evidence indicates that STEC might be detected as frequently as other bacterial pathogens. […] The laboratory strategy of culturing stool while simultaneously testing for Shiga toxin is more sensitive than other strategies for STEC identification and ensures that all STEC serotypes will be detected. […] Early diagnosis of STEC infection is important for determining the proper treatment promptly. […] Initiation of parenteral volume expansion early in the course of O157 STEC infection might decrease renal damage and improve patient outcome.

• #54 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Laboratories should always consult the manufacturer instructions for the assay being performed to determine procedures for specimen collection and handling, including specimen types that may be used with a particular assay or test system. […] The ideal specimen for testing is diarrheal stool; stool specimens should be collected as soon as possible after diarrhea begins, while the patient is acutely ill, and before any antibiotic treatment is administered. […] Shiga toxin testing should be performed on growth from broth culture or primary isolation media because this method is more sensitive and specific than direct testing of stool. […] In addition, because the amount of free fecal Shiga toxin in stools is often low, EIA testing of broth enrichments from stools or of growth from the primary isolation plate is recommended rather than direct testing of stools.

• #55 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  All stools submitted for testing from patients with acute community-acquired diarrhea (i.e., for detection of the enteric pathogens Salmonella, Shigella, and Campylobacter) should be cultured for O157 STEC on selective and differential agar. […] These stools should be simultaneously assayed for non-O157 STEC with a test that detects the Shiga toxins or the genes encoding these toxins. […] Evidence indicates that STEC might be detected as frequently as other bacterial pathogens. […] The laboratory strategy of culturing stool while simultaneously testing for Shiga toxin is more sensitive than other strategies for STEC identification and ensures that all STEC serotypes will be detected. […] Early diagnosis of STEC infection is important for determining the proper treatment promptly. […] Initiation of parenteral volume expansion early in the course of O157 STEC infection might decrease renal damage and improve patient outcome.

• #56 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  O157 STEC can usually be easily distinguished from most E. coli that are members of the normal intestinal flora by their inability to ferment sorbitol within 24 hours on sorbitol-containing agar isolation media. […] To isolate O157 STEC, a stool specimen should be plated onto a selective and differential medium such as sorbitol-MacConkey agar (SMAC), cefixime tellurite-sorbitol MacConkey agar (CT-SMAC), or CHROMagar O157. […] To identify O157 STEC, a portion of a well-isolated colony (i.e., a distinct, single colony) should be selected from the culture plate and tested in O157-specific antiserum or O157 latex reagent as recommended by the manufacturer. […] Colonies that agglutinate with one of the O157-specific reagents and do not agglutinate with normal serum or control latex reagent are presumed to be O157 STEC.

• #57 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  O157 STEC can usually be easily distinguished from most E. coli that are members of the normal intestinal flora by their inability to ferment sorbitol within 24 hours on sorbitol-containing agar isolation media. […] To isolate O157 STEC, a stool specimen should be plated onto a selective and differential medium such as sorbitol-MacConkey agar (SMAC), cefixime tellurite-sorbitol MacConkey agar (CT-SMAC), or CHROMagar O157. […] To identify O157 STEC, a portion of a well-isolated colony (i.e., a distinct, single colony) should be selected from the culture plate and tested in O157-specific antiserum or O157 latex reagent as recommended by the manufacturer. […] Colonies that agglutinate with one of the O157-specific reagents and do not agglutinate with normal serum or control latex reagent are presumed to be O157 STEC.

• #58 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Identification of non-O157 STEC typically occurs at the public health laboratory and not at clinical laboratories. […] However, this section includes the basic techniques for reference. […] Nonculture assays that detect the Shiga toxins produced by STEC (e.g., the Shiga toxin EIA) were first introduced in the United States in 1995. […] The primary advantage of nonculture assays for Shiga toxin is that they can be used to detect all serotypes of STEC. […] The Center for Devices and Radiological Health of the Food and Drug Administration (FDA) has approved several immunoassays for the detection of Shiga toxin in human specimens. […] Because the amount of free fecal Shiga toxin in stools is often low, EIA testing of enrichment broth cultures incubated overnight (16–24 hours at 37C [99F]), rather than direct testing of stool specimens, is recommended.

• #59 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Several tests for clinical or public health microbiology laboratories are available for the detection of STEC, and they may be used alone or in combination. […] No testing method is 100% sensitive or specific, and the predictive value of a positive test is affected by the patient population that a particular laboratory serves. […] Accurate, rapid identification of STEC, particularly of E. coli O157:H7, is critical for patient management and disease control. […] Therefore, the types of microbiologic tests chosen, performed, and reported and subsequent communication with treating clinicians are critical. […] Accumulated findings from investigations of STEC outbreaks, studies of sporadic STEC infections, and passive and active surveillance provide compelling evidence to support the recommendation that all stools submitted for routine testing to clinical laboratories from patients with community-acquired diarrhea should be cultured for O157 STEC and simultaneously tested for non-O157 STEC with an assay that detects Shiga toxins. […] These recommendations should improve the accuracy of diagnosing STEC infections, facilitate assessment of risk for severe illness, promote prompt diagnosis and treatment, and improve detection of outbreaks.

• #60 How is E. coli Infection Diagnosed? | Marler Clark

  https://marlerclark.com/foodborne-illnesses/e-coli/how-is-e-coli-infection-diagnosed

  Because the detection of Shiga toxin is independent of whether the STEC serotype is O157 or non-O157, non-O157 STEC became increasingly identified. […] When a stool sample is positive for Shiga toxin, generally, an antigen test is done at the clinical lab to see if the STEC serotype is O157. […] If not, by definition the strain is usually a non-O157 serotype. […] National guidelines recommend that when STEC is a possible cause of illness, a stool sample should both be tested for Shiga toxin (to detect non-O157 STEC or O157) and cultured specifically for E. coli O157:H7. […] When people are diagnosed with a STEC infection, frequent monitoring of hemoglobin, platelet counts, electrolytes, and indicators of kidney function is recommended to detect early signs of HUS so that appropriate treatment can occur.

• #61 Recommendations for Diagnosis of Shiga Toxin–Producing Escherichia coli Infections by Clinical Laboratories

  http://med.iiab.me/modules/en-cdc/www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm

  Certain specialized diagnostic methods might be used by public health laboratories for patients with HUS and during outbreak investigations. […] Immunomagnetic separation (IMS) is useful when the number of STEC organisms in a specimen is expected to be small. […] All O157 STEC isolates growing on selective agar should be subcultured to agar slants and forwarded as soon as possible to the appropriate public health laboratory for additional characterization. […] If agar slants are not available at the submitting laboratory, an acceptable alternative might be a swab that is heavily inoculated with representative growth and placed in transport medium. […] Not all specimens that test positive for Shiga toxin yield an easily identifiable O157 STEC or non-O157 STEC colony on subculture. […] All Shiga toxin–positive specimens or broths from which no STEC isolate was recovered should be forwarded to the appropriate public health laboratory for isolation and additional testing.

• #62 Shiga Toxins, EIA with Reflex to E. coli O157 Culture | Test Summary | Quest Diagnostics Shiga Toxins TEST, EIA with Reflex to E coli 0157 Culture Shiga Toxins TEST, EIA with Reflex to E coli 0157 Culture

  https://testdirectory.questdiagnostics.com/test/test-guides/TS_ShigaToxins_EIA/shiga-toxins-eia-with-reflex-to-e-coli-o157-culture

  A positive result (toxin detected) on the EIA indicates the presence of Shiga toxin produced by E coli or Shigella dysenteriae type 1. All positive results are reflexed to E coli O157 Culture. […] A not-detected toxin result indicates the absence of Shiga toxin or a level of toxin below the limit of detection of the assay. Neither a positive nor a negative result precludes the presence of other infectious agents. […] STEC cause foodborne and waterborne diarrheal disease worldwide which, if left undiagnosed, can progress to hemorrhagic colitis and/or hemolytic uremic syndrome (HUS). Since certain treatments and medications can increase the risk of HUS, prompt detection is necessary to prevent outbreaks and secondary transmission.

• #63 How is E. coli Infection Diagnosed? | Marler Clark

  https://marlerclark.com/foodborne-illnesses/e-coli/how-is-e-coli-infection-diagnosed

  Because the detection of Shiga toxin is independent of whether the STEC serotype is O157 or non-O157, non-O157 STEC became increasingly identified. […] When a stool sample is positive for Shiga toxin, generally, an antigen test is done at the clinical lab to see if the STEC serotype is O157. […] If not, by definition the strain is usually a non-O157 serotype. […] National guidelines recommend that when STEC is a possible cause of illness, a stool sample should both be tested for Shiga toxin (to detect non-O157 STEC or O157) and cultured specifically for E. coli O157:H7. […] When people are diagnosed with a STEC infection, frequent monitoring of hemoglobin, platelet counts, electrolytes, and indicators of kidney function is recommended to detect early signs of HUS so that appropriate treatment can occur.

• #64 Diagnosis and Treatment for Shiga Toxin-Producing Escherichia coli Associated Hemolytic Uremic Syndrome

  https://www.mdpi.com/2072-6651/15/1/10

  Shiga toxin-producing Escherichia coli (STEC)-associated hemolytic uremic syndrome (STEC-HUS) is a clinical syndrome involving hemolytic anemia (with fragmented red blood cells), low levels of platelets in the blood (thrombocytopenia), and acute kidney injury (AKI). […] Early diagnosis is of great significance for improving prognosis and reducing mortality and sequelae. In this review, we first briefly summarize the diagnostics for STEC-HUS, including history taking, clinical manifestations, fecal and serological detection methods for STEC, and complement activation monitoring. […] Clinically, the diagnosis of STEC-HUS mainly relies on prior potential infections or exposure history, corresponding clinical symptoms, and auxiliary examinations that indicate thrombotic microangiopathy, such as nonimmune hemolytic anemia (hematocrit < 30%, with fragmented erythrocytes in peripheral blood smear and a negative Coombs test), thrombocytopenia (platelet count < 150,000 mm³), and abnormal renal function (a serum creatinine concentration that exceeds the upper limit of the reference range for age) with or without hypocomplementemia.

• #65 Diagnosis and Treatment for Shiga Toxin-Producing Escherichia coli Associated Hemolytic Uremic Syndrome

  https://www.mdpi.com/2072-6651/15/1/10

  Shiga toxin-producing Escherichia coli (STEC)-associated hemolytic uremic syndrome (STEC-HUS) is a clinical syndrome involving hemolytic anemia (with fragmented red blood cells), low levels of platelets in the blood (thrombocytopenia), and acute kidney injury (AKI). […] Early diagnosis is of great significance for improving prognosis and reducing mortality and sequelae. In this review, we first briefly summarize the diagnostics for STEC-HUS, including history taking, clinical manifestations, fecal and serological detection methods for STEC, and complement activation monitoring. […] Clinically, the diagnosis of STEC-HUS mainly relies on prior potential infections or exposure history, corresponding clinical symptoms, and auxiliary examinations that indicate thrombotic microangiopathy, such as nonimmune hemolytic anemia (hematocrit < 30%, with fragmented erythrocytes in peripheral blood smear and a negative Coombs test), thrombocytopenia (platelet count < 150,000 mm³), and abnormal renal function (a serum creatinine concentration that exceeds the upper limit of the reference range for age) with or without hypocomplementemia.

• #66 Point-of-Care Diagnostic Devices for Detection of Escherichia coli O157:H7 Using Microfluidic Systems: A Focused Review

  https://www.mdpi.com/2079-6374/13/7/741

  Bacterial infections represent a serious and global threat in modern medicine; thus, it is very important to rapidly detect pathogenic bacteria, such as Escherichia coli (E. coli) O157:H7. […] To detect these pathogenic bacteria, many approaches have been applied by the biosensors community, for example, widely-used polymerase chain reaction (PCR), enzyme-linked immunosorbent assay (ELISA), culture-based method, and adenosine triphosphate (ATP) bioluminescence. […] The microfluidic platform based on surface plasmon resonance (SPR), electrochemical sensing, and rolling circle amplification (RCA) offers proper alternatives capable of supplementing the technological gap for pathogen detection. […] This review focuses on recent studies regarding accurate and rapid detection of E. coli O157:H7, with an emphasis on POC methods and devices that complement microfluidic systems.

• #67 Point-of-Care Diagnostic Devices for Detection of Escherichia coli O157:H7 Using Microfluidic Systems: A Focused Review

  https://www.mdpi.com/2079-6374/13/7/741

  Developing a microfluidic device that is ultra-sensitive, fast, highly selective (specific), easy to use, and portable as valuable proof-of-concept should be a challenge for public health. […] Numerous researchers have worked in the SPR domain as a POC diagnostic device for the accurate, rapid, and highly sensitive detection of E. coli O157:H7 with no cross-reaction. […] The specificity of E. coli detection plays a crucial role in SPR-based biosensors. […] Electrochemical biosensors are commonly produced and widely employed for the detection of food-borne and water-borne pathogens due to the possibilities of miniaturization and the ability to build disposable, flexible, and affordable sensing systems. […] A microfluidic platform for accurate and sensitive detection, known as the MEMS sensor, which operates on the principle of dielectrophoresis force.

• #68 Point-of-Care Diagnostic Devices for Detection of Escherichia coli O157:H7 Using Microfluidic Systems: A Focused Review

  https://www.mdpi.com/2079-6374/13/7/741

  Developing a microfluidic device that is ultra-sensitive, fast, highly selective (specific), easy to use, and portable as valuable proof-of-concept should be a challenge for public health. […] Numerous researchers have worked in the SPR domain as a POC diagnostic device for the accurate, rapid, and highly sensitive detection of E. coli O157:H7 with no cross-reaction. […] The specificity of E. coli detection plays a crucial role in SPR-based biosensors. […] Electrochemical biosensors are commonly produced and widely employed for the detection of food-borne and water-borne pathogens due to the possibilities of miniaturization and the ability to build disposable, flexible, and affordable sensing systems. […] A microfluidic platform for accurate and sensitive detection, known as the MEMS sensor, which operates on the principle of dielectrophoresis force.

• #69 Point-of-Care Diagnostic Devices for Detection of Escherichia coli O157:H7 Using Microfluidic Systems: A Focused Review

  https://www.mdpi.com/2079-6374/13/7/741

  Developing a microfluidic device that is ultra-sensitive, fast, highly selective (specific), easy to use, and portable as valuable proof-of-concept should be a challenge for public health. […] Numerous researchers have worked in the SPR domain as a POC diagnostic device for the accurate, rapid, and highly sensitive detection of E. coli O157:H7 with no cross-reaction. […] The specificity of E. coli detection plays a crucial role in SPR-based biosensors. […] Electrochemical biosensors are commonly produced and widely employed for the detection of food-borne and water-borne pathogens due to the possibilities of miniaturization and the ability to build disposable, flexible, and affordable sensing systems. […] A microfluidic platform for accurate and sensitive detection, known as the MEMS sensor, which operates on the principle of dielectrophoresis force.

• #70 Point-of-Care Diagnostic Devices for Detection of Escherichia coli O157:H7 Using Microfluidic Systems: A Focused Review

  https://www.mdpi.com/2079-6374/13/7/741

  Another innovative technology for E. coli O157:H7 detection is immunological assays, such as ELISA and lateral flow immunoassays (LFIA). […] Lastly, advancements in genomic sequencing technologies have revolutionized the detection of E. coli O157:H7. […] The incorporation of leading-edge technology into the microfluidic platform may provide very useful solutions for the relevant issues of diagnostic devices. […] This review focuses on the detection of E. coli O157:H7 using microfluidic systems, such as POC diagnostic devices including SPR, electrochemical sensing, and RCA. […] The most important performances for these methods are the limit of detection (LOD) and the detection time. […] The accurate detection of pathogenic bacteria is a critical issue for POC devices to ensure better therapy for the corresponding disease and early-stage control.

• #71 Escherichia coli (E coli) Infections Workup: Laboratory Studies, Imaging Studies, Procedures

  https://emedicine.medscape.com/article/217485-workup

  If available, a diarrhea panel polymerase chain reaction (PCR) test on stool can assist in discriminating between the different types of E coli. […] Definitive diagnosis is based on urine culture results, with a normal individual requiring 100,000 colony forming units (CFUs) of bacteria to be considered an infection, whereas this number is less in a catheterized patient. […] Recognize longstanding Foley catheters may have colonization and may not represent a true infection.

• #72 Laboratory Testing for E. coli | E. coli infection | CDC

  https://www.cdc.gov/ecoli/php/laboratories/index.html

  Get guidance for detecting Shiga toxin-producing E. coli (STEC). […] Learn about testing for other kinds of diarrheagenic E. coli. […] Recommendations for diagnosis of STEC infections by clinical laboratories. […] Guidance for public health laboratories: Isolation and characterization of STEC from clinical specimens. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC, although some have nucleic acid amplification tests available that can detect enterotoxigenic E. coli (ETEC) and other pathotypes. […] Public health laboratories can perform additional testing for non-STEC pathotypes; however, these labs usually do so only when investigating an outbreak of diarrheal illness of unknown origin. […] CDC offers confirmatory identification, serology, serotyping, subtyping, and virulence profiling for STEC. […] CDC accepts specimens for analysis only from state public health laboratories and other federal agencies.

• #73 Escherichia coli – Wikipedia

  https://en.wikipedia.org/wiki/Escherichia_coli

  Diagnosis of infectious diarrhea and identification of antimicrobial resistance is performed using a stool culture with subsequent antibiotic sensitivity testing. It requires a minimum of 2 days and maximum of several weeks to culture gastrointestinal pathogens. […] Current point of care molecular diagnostic tests can identify E. coli and antimicrobial resistance in the identified strains much faster than culture and sensitivity testing. Microarray-based platforms can identify specific pathogenic strains of E. coli and E. coli-specific AMR genes in two hours or less with high sensitivity and specificity, but the size of the test panel (i.e., total pathogens and antimicrobial resistance genes) is limited. Newer metagenomics-based infectious disease diagnostic platforms are currently being developed to overcome the various limitations of culture and all currently available molecular diagnostic technologies.

• #74 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  The uidA and tuf genes have been identified as potential targets for E. coli/Shigella detection using PCR. […] In developing countries, the identification of enteric pathogens in food and other edible items are time-consuming process and often results in wrong and delayed diagnosis. […] Thus, mPCR methodology permitted differentiation of EPEC, STEC, and EHEC strains from other pathogenic E. coli and the developed assay has the potential tool for rapid diagnosis of these pathogens. […] Detection of harmful bacteria with higher specificity, sensitivity, and reliability is the focus of nucleic acid-based approaches. […] Molecular diagnostic platforms have become promising alternatives to traditional methods for E. coli detection. In particular, LAMP assay and DNA biosensors because of their advantages of lower detection limits, and high reproducibility are preferred for pathogen detection. […] Nonetheless, CRISPR/Cas sensing platforms possess the potential to overcome the use of conventional molecular diagnostic platforms and become a promising tool for next-generation diagnostic platforms for sensitive and selective detection of DNA in clinical, food, and environmental samples.

• #75 How is E. coli Infection Diagnosed? | Marler Clark

  https://marlerclark.com/foodborne-illnesses/e-coli/how-is-e-coli-infection-diagnosed

  When a patient tests positive for any type of STEC, an isolate of the bacteria or the positive sample itself is often sent to the state public health lab for confirmation, determination of the serotype, and DNA fingerprinting. […] With the advent of whole genome sequencing, the serotype can be determined from the sequence.

• #76 Point-of-Care Diagnostic Devices for Detection of Escherichia coli O157:H7 Using Microfluidic Systems: A Focused Review

  https://www.mdpi.com/2079-6374/13/7/741

  Another innovative technology for E. coli O157:H7 detection is immunological assays, such as ELISA and lateral flow immunoassays (LFIA). […] Lastly, advancements in genomic sequencing technologies have revolutionized the detection of E. coli O157:H7. […] The incorporation of leading-edge technology into the microfluidic platform may provide very useful solutions for the relevant issues of diagnostic devices. […] This review focuses on the detection of E. coli O157:H7 using microfluidic systems, such as POC diagnostic devices including SPR, electrochemical sensing, and RCA. […] The most important performances for these methods are the limit of detection (LOD) and the detection time. […] The accurate detection of pathogenic bacteria is a critical issue for POC devices to ensure better therapy for the corresponding disease and early-stage control.

• #77 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  The uidA and tuf genes have been identified as potential targets for E. coli/Shigella detection using PCR. […] In developing countries, the identification of enteric pathogens in food and other edible items are time-consuming process and often results in wrong and delayed diagnosis. […] Thus, mPCR methodology permitted differentiation of EPEC, STEC, and EHEC strains from other pathogenic E. coli and the developed assay has the potential tool for rapid diagnosis of these pathogens. […] Detection of harmful bacteria with higher specificity, sensitivity, and reliability is the focus of nucleic acid-based approaches. […] Molecular diagnostic platforms have become promising alternatives to traditional methods for E. coli detection. In particular, LAMP assay and DNA biosensors because of their advantages of lower detection limits, and high reproducibility are preferred for pathogen detection. […] Nonetheless, CRISPR/Cas sensing platforms possess the potential to overcome the use of conventional molecular diagnostic platforms and become a promising tool for next-generation diagnostic platforms for sensitive and selective detection of DNA in clinical, food, and environmental samples.

• #78 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  Public health protection is of paramount importance that demands the rapid and accurate detection and quantitation of microorganisms in potable water and in various raw and processed foods to prevent undesirable outbreaks of microbial contamination. […] Amongst coliform bacteria, E. coli is commonly regarded as an indicator of fecal pollution of water supplies. […] It is necessary to develop new approaches for detecting E. coli in contaminating food and water samples. Optical or impedimetric biosensor systems have evolved as an alternative to the traditional tools for E. coli detection, enabling selective, specific, and cost-effective solutions. […] DNA-based sensing approaches have played an essential role in the development of sensing for the detection of E. coli. […] The advantage of PCR is that despite its inability to distinguish between live and dead cells, nonculturable cells may be detected rapidly.

• #79 Laboratory Testing for E. coli | E. coli infection | CDC

  https://www.cdc.gov/ecoli/php/laboratories/index.html

  Get guidance for detecting Shiga toxin-producing E. coli (STEC). […] Learn about testing for other kinds of diarrheagenic E. coli. […] Recommendations for diagnosis of STEC infections by clinical laboratories. […] Guidance for public health laboratories: Isolation and characterization of STEC from clinical specimens. […] Most U.S. clinical laboratories do not use tests that can detect diarrheagenic E. coli other than STEC, although some have nucleic acid amplification tests available that can detect enterotoxigenic E. coli (ETEC) and other pathotypes. […] Public health laboratories can perform additional testing for non-STEC pathotypes; however, these labs usually do so only when investigating an outbreak of diarrheal illness of unknown origin. […] CDC offers confirmatory identification, serology, serotyping, subtyping, and virulence profiling for STEC. […] CDC accepts specimens for analysis only from state public health laboratories and other federal agencies.

• #80 E coli lab types and laboratory diagnosis | PPT

  https://www.slideshare.net/slideshow/e-coli-lab-types-and-laboratory-diagnosis/86462437

  This document lists five types of Escherichia coli that can cause diarrhea: enterotoxigenic E. coli, enteropathogenic E. coli, enteroinvasive E. coli, enterohemorrhagic E. coli, and enteroaggregative E. coli. […] It then describes the laboratory diagnosis of E. coli, including collecting fecal or other samples depending on the site of infection, examining samples under microscopy and culturing them on different agar plates, conducting biochemical tests, and performing antibiotic sensitivity testing using disc diffusion. The goal is to identify the specific type of diarrheagenic E. coli. […] Laboratory diagnosis involves microscopic examination of samples showing gram-negative bacilli, as well as culture-based identification using selective media and biochemical tests to confirm lactose fermentation and other properties.

• #81 Diarrheagenic E. coli – Knowledge @ AMBOSS

  https://www.amboss.com/us/knowledge/diarrheagenic-e-coli/

  Escherichia coli (E. coli) is a gram-negative, rod-shaped flagellated bacterium. […] Enterohemorrhagic E. coli (EHEC), for instance, can lead to severe colitis and hemolytic uremic syndrome (HUS), particularly in children and infants. […] Supportive therapy without antibiotic therapy is also recommended for infection involving other strains of E. coli (ETEC, EPEC, and EIEC), but antibiotics may be indicated in certain cases. […] Diagnostic steps include culture and/or PCR from stool samples. […] Stool samples should be tested for EHEC in all cases of community-acquired diarrhea. […] Culture for O157:H7 on sorbitol MacConkey agar. […] Check for non-O157 EHEC by detection of Shiga toxins (via enzyme immunoassay) or Shiga toxin-encoding genes (via polymerase chain reaction). […] EHEC leads to HUS. […] EHEC is a subset of STEC (Shiga toxin-producing E.coli). […] ETEC causes Travelers’ diarrhea. […] EPEC causes Pediatric diarrhea. […] EIEC Invades the Intestinal mucosa.

• #82 Escherichia coli enteritis differential diagnosis – wikidoc

  https://www.wikidoc.org/index.php/Escherichia_coli_enteritis_differential_diagnosis

  E. coli enteritis must be differentiated from other causes of abdominal pain, diarrhea, and fever (less common), such as other infectious causes of gastroenteritis, including bacterial, viral, fungal, and parasitic pathogens, in addition to non-infectious causes, including acute pancreatitis, appendicitis, bowel obstruction, diverticulitis, drug reaction, hyperthyroidism, inflammatory bowel disease, mesenteric ischemia, peritonitis, and pneumonia. […] Enteritis caused by E. coli must be differentiated from other causes of acute diarrhea (with or without blood), abdominal pain, and fever (less common). […] Escherichia coli enteritis must be differentiated from other causes of viral, bacterial, and parasitic gastroenteritis.

• #83 Escherichia coli enteritis differential diagnosis – wikidoc

  https://www.wikidoc.org/index.php/Escherichia_coli_enteritis_differential_diagnosis

  E. coli enteritis must be differentiated from other causes of abdominal pain, diarrhea, and fever (less common), such as other infectious causes of gastroenteritis, including bacterial, viral, fungal, and parasitic pathogens, in addition to non-infectious causes, including acute pancreatitis, appendicitis, bowel obstruction, diverticulitis, drug reaction, hyperthyroidism, inflammatory bowel disease, mesenteric ischemia, peritonitis, and pneumonia. […] Enteritis caused by E. coli must be differentiated from other causes of acute diarrhea (with or without blood), abdominal pain, and fever (less common). […] Escherichia coli enteritis must be differentiated from other causes of viral, bacterial, and parasitic gastroenteritis.

• #84 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  Developing countries due to socio-economic conditions are more prone to frequent pathogenic outbreaks; inadequate sanitation and water quality monitoring are also responsible for such conditions. Therefore, it is of paramount importance to provide microbiologically safe food/water in order to protect public health. […] Molecular identification of water contaminants, mainly Escherichia coli, has been extensively used. Several of the molecular-based techniques are based on amplification and detection of nucleic acids. The advantages offered by these PCR-based methods over culture-based techniques are a higher level of specificity, sensitivity, and rapidity. […] This review seeks to provide a vista of the progress made in the detection of E. coli using nucleic acid-based approaches as part of the microbiological food/water quality monitoring.

• #85 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  The uidA and tuf genes have been identified as potential targets for E. coli/Shigella detection using PCR. […] In developing countries, the identification of enteric pathogens in food and other edible items are time-consuming process and often results in wrong and delayed diagnosis. […] Thus, mPCR methodology permitted differentiation of EPEC, STEC, and EHEC strains from other pathogenic E. coli and the developed assay has the potential tool for rapid diagnosis of these pathogens. […] Detection of harmful bacteria with higher specificity, sensitivity, and reliability is the focus of nucleic acid-based approaches. […] Molecular diagnostic platforms have become promising alternatives to traditional methods for E. coli detection. In particular, LAMP assay and DNA biosensors because of their advantages of lower detection limits, and high reproducibility are preferred for pathogen detection. […] Nonetheless, CRISPR/Cas sensing platforms possess the potential to overcome the use of conventional molecular diagnostic platforms and become a promising tool for next-generation diagnostic platforms for sensitive and selective detection of DNA in clinical, food, and environmental samples.

• #86 Molecular Diagnostic Platforms for Specific Detection of Escherichia coli | IntechOpen

  https://www.intechopen.com/chapters/79820

  The uidA and tuf genes have been identified as potential targets for E. coli/Shigella detection using PCR. […] In developing countries, the identification of enteric pathogens in food and other edible items are time-consuming process and often results in wrong and delayed diagnosis. […] Thus, mPCR methodology permitted differentiation of EPEC, STEC, and EHEC strains from other pathogenic E. coli and the developed assay has the potential tool for rapid diagnosis of these pathogens. […] Detection of harmful bacteria with higher specificity, sensitivity, and reliability is the focus of nucleic acid-based approaches. […] Molecular diagnostic platforms have become promising alternatives to traditional methods for E. coli detection. In particular, LAMP assay and DNA biosensors because of their advantages of lower detection limits, and high reproducibility are preferred for pathogen detection. […] Nonetheless, CRISPR/Cas sensing platforms possess the potential to overcome the use of conventional molecular diagnostic platforms and become a promising tool for next-generation diagnostic platforms for sensitive and selective detection of DNA in clinical, food, and environmental samples.

• #87 E. coli – Diagnosis and treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/e-coli/diagnosis-treatment/drc-20372064

  To diagnose illness caused by E. coli infection, your doctor sends a sample of your stool to a laboratory to test for the presence of E. coli bacteria. The bacteria may be cultured to confirm the diagnosis and identify specific toxins, such as those produced by E. coli O157:H7. […] For an E. coli infection, some basic questions to ask your doctor include: What kinds of tests do I need? […] Your doctor may ask: Are you also having abdominal cramps? […] If you or your child has an E. coli infection, it may be tempting to use an anti-diarrheal medication, but don’t. Diarrhea is one way the body rids itself of toxins. Preventing diarrhea slows that process down.

• #88 E. coli: Infection, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16638-e-coli-infection

  Healthcare providers specifically dont treat STEC with antibiotics or antidiarrheal medicines. […] But if you have another type of E. coli infection like a UTI, meningitis or sepsis or if your symptoms are severe, your provider will treat you with antibiotics. […] The most important thing you can do to protect against E. coli infections is to wash your hands. […] E. coli infections can cause everything from brief bouts of diarrhea to life-threatening illness. […] Most people recover on their own or with antibiotic treatment. […] Yes, E. coli infections can be deadly. […] See a healthcare provider if you have diarrhea for more than three days, symptoms of a UTI or other health concerns.

• #89 E. coli Gastroenteritis – Gastrointestinal Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/gastrointestinal-disorders/gastroenteritis/e-coli-gastroenteritis

  Several different subtypes of Escherichia coli cause diarrhea. […] When needed, organism-specific diagnosis can be made by polymerase chain reaction testing of stool. […] Stool studies for a bacterial cause are indicated in patients with bloody or heme-positive stool, fever, moderate to severe diarrhea, or diarrhea lasting more than 7 days, in those 70 years old or older, or in those with inflammatory bowel disease or immunocompromising disorders such as HIV/AIDS. […] A rapid stool assay for Shiga toxin or, when available, a test for the gene that encodes the toxin may be helpful. […] Each of the E. coli subtypes can be detected in stool by polymerase chain reaction (PCR) testing, typically using a multiplex PCR panel. […] Stool testing is not needed routinely, but if an enterohemorrhagic strain is suspected, a rapid stool assay for Shiga toxin or gene-based testing should be done. […] Antibiotics are generally not needed and can increase the risk of hemolytic-uremic syndrome when Shiga toxin-producing strains are involved. […] Antidiarrheal agents are safe for adults with watery diarrhea but should be avoided in children.

• #90 E. coli Infection: Signs, Symptoms, Contagious, Treatments & Causes

  https://www.emedicinehealth.com/e_coli_escherichia_coli_0157h7_e_coli_0157h7/article_em.htm

  What Causes E. coli Infection? […] The bacteria can produce two types of toxins, termed Shiga (Stx 1 and Stx 2, also termed Vero toxins) toxins. These toxins (for example, E. coli and Shiga toxin) are almost identical to the toxins produced by Shigella spp. and are capable of killing human intestinal cells by disrupting their protein synthesis. When the cells die, intestinal function is disrupted and intestinal bleeding can occur. The toxins and the damage that occurs to the intestines can lead to kidney damage, anemia, platelet aggregation, and death. […] When Should I See a Doctor if I Think I May Have E. coli? […] Since nausea, vomiting, low-grade fever, and diarrhea are common symptoms of many diseases, many clinicians suggest that affected individuals should seek medical care if:

• #91 E. coli: Infection, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16638-e-coli-infection

  Symptoms of an E. coli infection include watery diarrhea, nausea, vomiting, stomach pains, low fever and fatigue. […] An E. coli infection is any illness you get from strains of E. coli bacteria. […] Many strains of E. coli cause mild infections. But some strains, like those that produce Shiga toxin, can cause serious illness, including kidney damage. […] Common types of E. coli infection include gastrointestinal and urinary tract infections (UTIs). […] There are about 265,000 Shiga toxin-producing E. coli (STEC) infections each year in the U.S. STEC is the most common cause of E. coli outbreaks and serious illness from E. coli in the U.S. […] If you have diarrhea or other digestive symptoms, your provider will test a stool (poop) sample for E. coli. […] Specific tests for E. coli include: Stool test, Urinalysis or urine culture, Blood culture, Spinal tap (lumbar puncture).

• #92 Escherichia coli (E coli) Infections Workup: Laboratory Studies, Imaging Studies, Procedures

  https://emedicine.medscape.com/article/217485-workup

  If available, a diarrhea panel polymerase chain reaction (PCR) test on stool can assist in discriminating between the different types of E coli. […] Definitive diagnosis is based on urine culture results, with a normal individual requiring 100,000 colony forming units (CFUs) of bacteria to be considered an infection, whereas this number is less in a catheterized patient. […] Recognize longstanding Foley catheters may have colonization and may not represent a true infection.

• #93 E. coli – Diagnosis and treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/e-coli/diagnosis-treatment/drc-20372064

  To diagnose illness caused by E. coli infection, your doctor sends a sample of your stool to a laboratory to test for the presence of E. coli bacteria. The bacteria may be cultured to confirm the diagnosis and identify specific toxins, such as those produced by E. coli O157:H7. […] For an E. coli infection, some basic questions to ask your doctor include: What kinds of tests do I need? […] Your doctor may ask: Are you also having abdominal cramps? […] If you or your child has an E. coli infection, it may be tempting to use an anti-diarrheal medication, but don’t. Diarrhea is one way the body rids itself of toxins. Preventing diarrhea slows that process down.

• #94 E. coli: Infection, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16638-e-coli-infection

  Healthcare providers specifically dont treat STEC with antibiotics or antidiarrheal medicines. […] But if you have another type of E. coli infection like a UTI, meningitis or sepsis or if your symptoms are severe, your provider will treat you with antibiotics. […] The most important thing you can do to protect against E. coli infections is to wash your hands. […] E. coli infections can cause everything from brief bouts of diarrhea to life-threatening illness. […] Most people recover on their own or with antibiotic treatment. […] Yes, E. coli infections can be deadly. […] See a healthcare provider if you have diarrhea for more than three days, symptoms of a UTI or other health concerns.

• #95 E Coli Infection – NYC Health

  https://www.nyc.gov/site/doh/health/health-topics/e-coli-infection.page

  Doctors can test for Shiga toxin-producing E. coli through stool tests. […] Most infected people recover without antibiotics or other specific treatment in five to 10 days. […] Antibiotics and anti-diarrheal medicines are not recommended.

• #96 Escherichia coli Infections – Infections – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/infections/bacterial-infections-gram-negative-bacteria/escherichia-coli-infections

  Many other E. coli infections, usually bladder or other urinary tract infections, are treated with antibiotics, such as trimethoprim/sulfamethoxazole, nitrofurantoin, or a fluoroquinolone. However, many bacteria, particularly those acquired in a health care facility, are resistant to some antibiotics. […] Prevention of E. coli infections involves avoiding unpasteurized milk and other dairy products made from unpasteurized milk, thoroughly cooking beef, and thoroughly washing the hands with soap and running water after using the toilet, changing diapers, and having contact with animals or their environment and before and after preparing or eating food.

• #97 E. coli infection – symptoms and treatment | healthdirect

  https://www.healthdirect.gov.au/e-coli-infection

  If you have diarrhoea and aren’t very sick, you should keep hydrated by drinking plenty of fluids. […] Don’t take anti-vomiting or anti-diarrhoeal medications unless your doctor has recommended them. […] How can E. coli infections be prevented? […] You can reduce your chance of E. coli infection by not eating unclean or under-cooked foods. […] You can also reduce your chance of getting E. coli by good hygiene. Always wash your hands after going to the toilet or changing a nappy. […] It is important to prepare, cook and store your food safely.

• #98 Escherichia coli Infections – Infections – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/infections/bacterial-infections-gram-negative-bacteria/escherichia-coli-infections

  Many other E. coli infections, usually bladder or other urinary tract infections, are treated with antibiotics, such as trimethoprim/sulfamethoxazole, nitrofurantoin, or a fluoroquinolone. However, many bacteria, particularly those acquired in a health care facility, are resistant to some antibiotics. […] Prevention of E. coli infections involves avoiding unpasteurized milk and other dairy products made from unpasteurized milk, thoroughly cooking beef, and thoroughly washing the hands with soap and running water after using the toilet, changing diapers, and having contact with animals or their environment and before and after preparing or eating food.

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