Materiały źródłowe

• #1 Poison ivy rash – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poison-ivy/symptoms-causes/syc-20376485

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #2 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics/print

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #3 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] By touching something that has urushiol on it, such as animal fur or garden tools. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #4 Poison ivy rash | Beacon Health System

  https://www.beaconhealthsystem.org/library/diseases-and-conditions/poison-ivy-rash?content_id=CON-20376467

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oil is in the leaves, stems and roots of poison ivy, poison oak and poison sumac. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. You might then transfer it to your face or body by touching or rubbing. If the contaminated object isn’t cleaned, the urushiol on it can still cause a skin reaction years later. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #5 Poison ivy rash // Middlesex Health

  https://middlesexhealth.org/learning-center/diseases-and-conditions/poison-ivy-rash

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #6 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Plants within the Anacardiaceae family cause Toxicodendron toxicity. It includes plants such as poison ivy, poison oak, poison sumac and is the most common cause of allergic dermatitis in North America. […] Toxicodendron dermatitis is the most common cause of allergic contact dermatitis in North America and is caused by skin exposure to urushiol, producing a type IV hypersensitivity reaction. […] It is estimated that 50 to 75% of adults are allergic to urushiol. […] A large portion of the population is sensitized to urushiol. […] Urushiol is the primary allergenic cause of contact dermatitis and is typically encountered by brushing up against damaged stems or leaves. […] Initial exposure results in pruritus and erythema, followed by a papulovesicular eruption, edema, and oozing within 10 to 14 days.

• #7 Poison Ivy and the Immune System | HowStuffWorks

  https://science.howstuffworks.com/life/botany/poison-ivy2.htm

  The rash caused by poison ivy often is red and sometimes causes blisters. […] But when urushiol from the poison ivy plant touches the skin, it instigates an immune response, called dermatitis, to what would otherwise be a harmless substance. […] Urushiol makes its way down through the skin, where it is metabolized, or broken down. […] Immune cells called T lymphocytes (or T-cells) recognize the urushiol derivatives as a foreign substance, or antigen. […] The allergic reaction to poison ivy is known as delayed hypersensitivity. […] Most people don’t have a reaction the first time they touch poison ivy, but develop an allergic reaction after repeated exposure. […] Sensitivity usually decreases with age and with repeat exposures to the plant.

• #8 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Symptoms of re-exposure are more acute and appear in 24 to 72 hours. […] Activation of T cells on initial exposure results in the production of CD4 and CD8 T cells sensitive to urushiol, which then activate a more robust immune response on repeat exposure to the offending agent. […] Many of these pathways are the target of corticosteroid treatment.

• #9 What Is Poison Ivy? Symptoms, Causes, Diagnosis, Treatment, and Prevention

  https://www.everydayhealth.com/poison-ivy/guide/

  Poison ivy contains an oily resin known as urushiol. Its found in the leaves, stems, and roots of the plant, and its both colorless and odorless. […] When the oil from poison ivy touches your skin, it bonds to the area and causes a reaction from your bodys own immune system. This reaction is known as allergic contact dermatitis. […] Our bodies become sensitized to poison ivy after an initial exposure, says Joshua Zeichner, MD, the director of cosmetic and clinical research in dermatology at Mount Sinai Hospital in New York City. Upon future exposure, our immune system becomes activated, leading to significant inflammation. […] In addition to direct contact and touching contaminated items, you can also have a poison ivy reaction by breathing smoke from the plant if its burned. This can harm your nasal passages and lungs, and can cause a severe reaction in some people.

• #10 10 Things to Know About Poison Ivy Rash

  https://mydoctor.kaiserpermanente.org/mas/news/10-things-to-know-about-poison-ivy-rash-2184009

  You may have been exposed to poison ivy, which causes tens of millions of people to have poison ivy rash each year. […] Poison ivy rash—also called poison ivy dermatitis—is caused by contact with a sticky oil called urushiol. You can get the rash from directly touching a poison ivy plant, touching anything that has come in contact with a poison ivy plant or being exposed to smoke from burning these plants. […] The rash usually doesn’t show up immediately after exposure to urushiol. People have what is called a delayed hypersensitivity reaction. The rash may show up more than a week after the first exposure to the oil but may appear within 12-48 hours following subsequent exposures. […] Symptoms of poison ivy rash include itching, hives, and blisters. The rash usually appears as red streaks in the area where the oil touched the skin. […] If a bacterial infection develops, we may also prescribe antibiotics.

• #11 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  When skin comes into contact with poison ivy sap, a painful allergic reaction called contact dermatitis or Rhus dermatitis may occur. […] The substance that causes this allergic reaction is urushiol, a compound in the poison ivy sap. […] About 9 in 10 people are sensitive to poison ivy sap. They react to even minute quantities of urushiol. […] The symptoms of an allergic reaction to poison ivy usually appear 24 to 48 hours after contact with the sap. […] The first sign of an allergic reaction to poison ivy is a strong itching with redness at the site of contact. […] The seriousness of an allergic reaction depends on: The persons degree of sensitivity, The amount of sap that comes into contact with the skin, The area of the body affected. […] The most serious allergic reactions affect areas of the body where the skin is thin, like the face and the genitals.

• #12 Poison Ivy Rash, Poison Oak, Poison Sumac: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/10655-poison-plants-poison-ivy–poison-oak–poison-sumac

  Poison ivy, poison oak and poison sumac produce urushiol oil. Almost everyone is allergic to it. The oil causes an allergic reaction when it touches your skin. The itchy rash that develops is a type of allergic contact dermatitis. […] Up to 90% of people who come into contact with poison ivy oil develop an itchy rash. You dont have to be exposed to much: 50 micrograms (g) of urushiol an amount smaller than a grain of salt is enough to cause a reaction. […] Poison ivy symptoms almost always include: An itchy skin rash. Redness and swelling. Blisters. […] Poison ivy, poison oak and poison sumac produce urushiol oil. Almost everyone is allergic to it. The oil causes an allergic reaction when it touches your skin. The itchy rash that develops is a type of allergic contact dermatitis. […] Depending on your skins sensitivity, a rash may develop within a few hours or a few days after initial contact with urushiol oil. The intensity of the itching can vary, and some people may develop one or two small rashes while others develop rashes all over their bodies.

• #13 Poison ivy rash: Causes, treatment, and prevention

  https://www.medicalnewstoday.com/articles/265375

  According to the American Academy of Dermatology, 85% of the population in the United States will have an allergic reaction to poison ivy. If these people touch the plant, they will develop a rash. […] The remaining 15% may not react to poison ivy. However, even those who have never reacted to it should take care, as repeated exposure to the plant can increase the likelihood of a reaction.

• #14 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  When skin comes into contact with poison ivy sap, a painful allergic reaction called contact dermatitis or Rhus dermatitis may occur. […] The substance that causes this allergic reaction is urushiol, a compound in the poison ivy sap. […] About 9 in 10 people are sensitive to poison ivy sap. They react to even minute quantities of urushiol. […] The symptoms of an allergic reaction to poison ivy usually appear 24 to 48 hours after contact with the sap. […] The first sign of an allergic reaction to poison ivy is a strong itching with redness at the site of contact. […] The seriousness of an allergic reaction depends on: The persons degree of sensitivity, The amount of sap that comes into contact with the skin, The area of the body affected. […] The most serious allergic reactions affect areas of the body where the skin is thin, like the face and the genitals.

• #15 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Plants within the Anacardiaceae family cause Toxicodendron toxicity. It includes plants such as poison ivy, poison oak, poison sumac and is the most common cause of allergic dermatitis in North America. […] Toxicodendron dermatitis is the most common cause of allergic contact dermatitis in North America and is caused by skin exposure to urushiol, producing a type IV hypersensitivity reaction. […] It is estimated that 50 to 75% of adults are allergic to urushiol. […] A large portion of the population is sensitized to urushiol. […] Urushiol is the primary allergenic cause of contact dermatitis and is typically encountered by brushing up against damaged stems or leaves. […] Initial exposure results in pruritus and erythema, followed by a papulovesicular eruption, edema, and oozing within 10 to 14 days.

• #16 Toxicodendron Contact Dermatitis: A Case Report and Brief Review

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7733371/

  Currently available treatments for TCD are unsatisfactory, often only slightly easing the symptoms while the condition slowly fades on its own. […] This article describes the case of a middle-aged man who developed severe TCD following exposure to poison ivy. […] Approximately 50 to 75 percent of the US adult population is clinically sensitive to poison ivy, oak, and sumac. […] The cutaneous reaction usually begins 12 to 72 hours after contact with the plant, manifesting with intense itching that is often accompanied by the formation of vesicles or bullae, which tend to present in linear configurations following the pattern of contact made by plants leaves, berries, stems, or vines. […] Key to preventing TCD is the ability to recognize these plants and, thus, avoid contact with them.

• #17 Poison Ivy Rash, Poison Oak, Poison Sumac: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/10655-poison-plants-poison-ivy–poison-oak–poison-sumac

  Poison ivy, poison oak and poison sumac produce urushiol oil. Almost everyone is allergic to it. The oil causes an allergic reaction when it touches your skin. The itchy rash that develops is a type of allergic contact dermatitis. […] Up to 90% of people who come into contact with poison ivy oil develop an itchy rash. You dont have to be exposed to much: 50 micrograms (g) of urushiol an amount smaller than a grain of salt is enough to cause a reaction. […] Poison ivy symptoms almost always include: An itchy skin rash. Redness and swelling. Blisters. […] Poison ivy, poison oak and poison sumac produce urushiol oil. Almost everyone is allergic to it. The oil causes an allergic reaction when it touches your skin. The itchy rash that develops is a type of allergic contact dermatitis. […] Depending on your skins sensitivity, a rash may develop within a few hours or a few days after initial contact with urushiol oil. The intensity of the itching can vary, and some people may develop one or two small rashes while others develop rashes all over their bodies.

• #18 Poison Ivy, Oak, And Sumac | Advanced Dermatology and Skin Cancer Center

  https://www.advancedderm.net/poison-ivy-poison-oak-poison-sumac/

  Patients who come into contact with poisonous plants, including poison ivy, poison oak, or poison sumac, most likely will experience an allergic reaction as a result of touching the plants themselves or objects contaminated with the oil from these plants. […] Poison ivy is a common poisonous plant that causes itchy, uncomfortable skin rashes. Along with poison ivy, poison oak and poison sumac are toxic plants that can cause rashes. These plants produce an oily sap called urushiol that causes an allergic reaction in the skin when touched called contact dermatitis a red, itchy rash caused by direct contact with a substance or an allergic reaction to it. […] A poison ivy rash is common approximately 90 percent of patients who come into contact with poison ivy, poison sumac, or poison oak develop an allergic reaction. Whats more, you dont have to be exposed to a significant amount of urushiol to develop a rash it takes an amount smaller than a grain of salt to cause a reaction.

• #19 3 Causes of Poison Ivy & How To Treat It | Vujevich Dermatology

  https://www.vucare.com/2019/09/20/causes-of-poison-ivy/

  There are three causes to how poison ivy starts. These are direct contact, indirect contact, and airborne contact. […] Direct Contact is exactly as it sounds and is the most common way to contract the rash. This happens by touching poison ivy, oak, or sumac. Every part of the plant contains the oil. […] Indirect Contact occurs when you touch something that has urushiol oil on it. The oil sticks to most things, including a pets fur, gardening tools, and sports equipment. […] Airborne Contact occurs when the oil is spread through the air and lands on the skin. This can happen when poisonous leaves are burned. […] Poison ivy rash is caused by urushiol oil. Eighty to 90 percent of people exposed to 50 micrograms of urushiol (thats less than one grain of table salt!) develop a rash. But, some people see no reaction from contact with urushiol oil. […] Sensitivity to urushiol oil can change over your lifetime. Children who developed the rash as a child may completely lose their sensitivity to the oil. Likewise, adults who never had the rash as a child may develop a sensitivity to the oil.

• #20 What Causes Poison Ivy Reactions? | Outdoor Blog

  https://www.outdoorjoes.com/a-rhus-tox-guide/2020/04/10/what-causes-poison-ivy-reactions?srsltid=AfmBOooAcEVArBs4lbWjzP1latRoS0I_TNuyKXdINpP79-iq2IE9439M

  What caused poison ivy reactions? […] All reactions to poison ivy are caused by varying degrees of allergy to the plant. […] Up to 85% of people have a poison ivy allergy to some degree. […] Many people may be surprised to learn that poison ivy rashes are not actually caused by the plant. They are caused by an individuals allergy to the plant. […] The truth about poison ivy allergies is complicated. The allergy is not one you are born with like other allergies. It is acquired after the initial encounter with poison ivy. […] Poison ivy allergies are always changing.

• #21 3 Causes of Poison Ivy & How To Treat It | Vujevich Dermatology

  https://www.vucare.com/2019/09/20/causes-of-poison-ivy/

  There are three causes to how poison ivy starts. These are direct contact, indirect contact, and airborne contact. […] Direct Contact is exactly as it sounds and is the most common way to contract the rash. This happens by touching poison ivy, oak, or sumac. Every part of the plant contains the oil. […] Indirect Contact occurs when you touch something that has urushiol oil on it. The oil sticks to most things, including a pets fur, gardening tools, and sports equipment. […] Airborne Contact occurs when the oil is spread through the air and lands on the skin. This can happen when poisonous leaves are burned. […] Poison ivy rash is caused by urushiol oil. Eighty to 90 percent of people exposed to 50 micrograms of urushiol (thats less than one grain of table salt!) develop a rash. But, some people see no reaction from contact with urushiol oil. […] Sensitivity to urushiol oil can change over your lifetime. Children who developed the rash as a child may completely lose their sensitivity to the oil. Likewise, adults who never had the rash as a child may develop a sensitivity to the oil.

• #22 Poison ivy, oak, and sumac: Foothill Dermatology Medical Center: Dermatology

  https://www.foothillderm.com/blog/poison-ivy-oak-and-sumac

  Rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all). […] What causes this rash? There are 3 ways to get this rash: Direct contact By touching poison ivy, poison oak, or poison sumac, you can get a rash. Every part of these plants the leaves, stems, roots, and flowers contains the oil. […] Urushiol can stick to almost anything. If you touch a pet’s fur, gardening tool, or sports equipment that has the oil on it, you can get a rash. […] Burning these poisonous plants releases particles of urushiol into the air. These airborne particles can land on the skin. […] It is not possible to get this rash from touching someone who has the rash. The skin absorbs the oil too quickly. You cannot get a rash from getting the fluid in the blisters on your skin.

• #23 Poison ivy rash – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poison-ivy/symptoms-causes/syc-20376485

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #24 Poison Ivy, Sumac & Oak – Pariser Dermatology

  https://pariserderm.com/services/common-concerns/poison-ivy-sumac-oak/

  Rash from poison ivy. Many people develop an itchy rash that causes lines or streaks that look like this. […] Many people get a rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all). The itchy, blistering rash often does not start until 12 to 72 hours after you come into contact with the oil. […] The rash is not contagious and does not spread. It might seem to spread, but this is a delayed reaction. […] All parts of these plants contain urushiol. The leaves, the stems, and even the roots contain urushiol. Touching any part of the plant can cause an allergic reaction. […] Touching anything that has urushiol on it can cause an allergic reaction. You can have an allergic reaction from touching gardening tools, sporting equipment, and even a pet’s fur. […] Burning these plants releases urushiol into the air. You can have an allergic reaction if airborne particles land on your skin.

• #25 Poison Ivy in Kids (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/poison-ivy.html

  Poison ivy is a plant that can cause an itchy rash when touched. Poison ivy, poison oak, and poison sumac all contain urushiol (yoo-ROO-shee-ol), a sticky, colorless, odorless oil. Urushiol is not poisonous. It’s considered an allergen because it causes an allergic reaction in most people who touch it. […] The allergic reaction to poison ivy includes a rash with blisters, itching, and sometimes swelling. […] The leaves of poison ivy plants release urushiol when they’re bumped, torn, or brushed against. When the oil is released, the leaves may look shiny or have black spots. Then, it easily can get on skin.

• #26 Poison Ivy, Oak, & Sumac: Allergic Reactions and Prevention

  https://www.webmd.com/skin-problems-and-treatments/understanding-poison-ivy-oak-sumac-basics

  Poison ivy, poison oak, and poison sumac are all plants that can cause a temporary, irritating rash when they come in contact with your skin. This rash is a form of allergic contact dermatitis. […] Up to 85% of Americans are allergic to poison ivy, leaving at least 15% resistant to any reaction. […] If you are allergic to poison ivy, you’re more likely to be allergic to poison oak and poison sumac, because all three plants contain the same rash-triggering plant oil called urushiol. […] Many people break out in a rash when urushiol touches the skin. […] Urushiol quickly penetrates the skin, often leaving red lines that show where you brushed against the plant. […] Symptoms appear 24 to 72 hours after exposure. […] Three types of transmission can occur: Direct contact with the plant, Indirect contact when you touch pets, gardening tools, sports equipment, or other objects that had direct contact with the plant, Airborne contact from burning these plants, which releases particles of urushiol into the air that can penetrate the skin, eyes, nose, throat, or respiratory system. […] Poison ivy, oak, and sumac all fall into the plant genus called Toxicodendron, so the allergic reaction to all of these plants has the same name: Toxicodendron dermatitis. […] All four plants contain urushiol, so the skin reaction and treatment are essentially the same.

• #27 Toxicodendron Contact Dermatitis: A Case Report and Brief Review

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7733371/

  The oily resin present in all parts of the plants is called urushiol, an allergen that is a major cause of contact dermatitis in the United States, to which around 85 percent of the population is sensitive. […] Patients should be made aware that Toxicodendron contact dermatitis can even be triggered by handling dead or dried plant parts. […] More effective treatments include topical and/or systemic steroids and the use of aluminum acetate solution (Burow solution). […] The rash caused by contact with the leaves, stems, or berries of these plants is highly pruritic, can last for weeks, and can have a substantially negative impact on a patient’s quality of life, including loss of sleep and missed work days.

• #28 Poison ivy rash – Dermatologist

  https://www.dermatologist.org.uk/skin-conditions/poison-ivy-rash/

  A reaction occurs if you touch, brush against or handle objects which have been in contact with urushiol. This even applies to pets: urushiol sticks to their fur but doesnt harm them in any way. But it transfers to you when you stroke or touch your pet in any way. […] The thing to remember is that urushiol remains allergenic for a long period of time and we are talking years here. For example, you may own a jacket which has been in contact with urushiol without your knowledge. This substance remains on the jacket, even after several years and only needs you to handle this jacket to trigger a reaction. […] Urushiol is also present in smoke from burning poison ivy and other similar plants such as sumac. It is possible to inhale urushiol as a result which then irritates your eyes, nose and throat.

• #29 Poison Ivy, Oak and Sumac: Pictures of Rashes & Plants

  https://www.webmd.com/allergies/ss/slideshow-poison-plants

  Poison ivy, poison oak, and poison sumac grow in wooded or marshy areas throughout North America. They have a sticky, long-lasting oil called urushiol that causes an itchy, blistering rash after it touches your skin. […] Urushiol begins to stick within minutes. If you know you’ve made contact with poison ivy, oak, or sumac, wash the area with lukewarm water and soap ASAP. […] Most people — about 85% — are allergic to urushiol. You can be affected by it at any age. […] Don’t burn poison ivy, oak, or sumac. Particles of urushiol remain in the smoke and can aggravate your eyes, nose, and respiratory tract, and can land on the skin.

• #30 Poison ivy rash – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poison-ivy/symptoms-causes/syc-20376485

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #31 Outsmarting Poison Ivy and Other Poisonous Plants | FDA

  https://www.fda.gov/consumers/consumer-updates/outsmarting-poison-ivy-and-other-poisonous-plants

  First comes the itching, then a red rash, and then blisters. These symptoms of poison ivy, poison oak, and poison sumac can emerge any time from a few hours to several days after exposure to the plant oil found in the sap of these poisonous plants. The culprit: the urushiol oil. […] Poison ivy and other poison plant rashes cant be spread from person to person. But it is possible to pick up the rash from plant oil that may have stuck to clothing, pets, garden tools, and other items that have come in contact with these plants. The plant oil lingers (sometimes for years) on virtually any surface until its washed off with water or rubbing alcohol. […] The rash will occur only where the plant oil has touched the skin, so a person with poison ivy cant spread it on the body by scratching. It may seem like the rash is spreading if it appears over time instead of all at once. But this is either because the plant oil is absorbed at different rates on different parts of the body or because of repeated exposure to contaminated objects or plant oil trapped under the fingernails. Even if blisters break, the fluid in the blisters is not plant oil and cannot further spread the rash.

• #32 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] By touching something that has urushiol on it, such as animal fur or garden tools. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #33 Poison Ivy, Sumac & Oak – Pariser Dermatology

  https://pariserderm.com/services/common-concerns/poison-ivy-sumac-oak/

  Rash from poison ivy. Many people develop an itchy rash that causes lines or streaks that look like this. […] Many people get a rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all). The itchy, blistering rash often does not start until 12 to 72 hours after you come into contact with the oil. […] The rash is not contagious and does not spread. It might seem to spread, but this is a delayed reaction. […] All parts of these plants contain urushiol. The leaves, the stems, and even the roots contain urushiol. Touching any part of the plant can cause an allergic reaction. […] Touching anything that has urushiol on it can cause an allergic reaction. You can have an allergic reaction from touching gardening tools, sporting equipment, and even a pet’s fur. […] Burning these plants releases urushiol into the air. You can have an allergic reaction if airborne particles land on your skin.

• #34 Poison ivy, oak, and sumac: Who gets a rash, and is it contagious?

  https://www.aad.org/public/diseases/itchy-skin/poison-ivy-oak-and-sumac

  Poison ivy, oak, and sumac all contain an oil called urushiol (yur-oo-shee-aal). If you have an allergic reaction to this oil, you can develop a rash. Because most people are allergic to this oil, just about everyone who comes into contact with it develops a rash. […] The more exposure you have to these plants, the more severe your allergic reaction tends to be. […] Anyone can have an allergic reaction to one of these plants, even a baby. […] Yes. These plants are poisonous year-round. Touching any part of these plants, including the roots, can cause a rash, even during the winter. […] The rash isn’t contagious. If someone has a rash, touching that rash won’t cause a rash on your skin. You can develop a rash, if you touch the person’s skin or clothing while oil from one of these plants is still on it. […] Yes, the oil that causes this rash can stick to just about anything, including fur. […] If your pet has brushed up against one of these plants, you can get the oil that causes the rash on your skin when you touch your pet. This could lead to a rash.

• #35 Is poison ivy contagious? – Harvard Health

  https://www.health.harvard.edu/staying-healthy/is-poison-ivy-contagious

  Poison ivy rashes are not contagious. You will get a rash from poison ivy only if you come into contact with urushiol oil, which is the plant oil in poison ivy that triggers the rash. […] The rash only occurs on parts of the body that were actually exposed to the plant oil. Poison ivy rashes can appear to spread if urushiol oil is trapped under your fingernails and you scratch an itch. […] You can get it from clothing or other items that have the plant oil on them. For example, the clothes your spouse was wearing that came into contact with the poison ivy plant. Poison ivy oil can cling to garden tools or even pet fur. The oil from poison ivy is known to linger. According to the FDA, it can stick around on surfaces, sometimes for years, until it is washed away using water or rubbing alcohol.

• #36 Poison Ivy, Oak and Sumac: Pictures of Rashes & Plants

  https://www.webmd.com/allergies/ss/slideshow-poison-plants

  Poison ivy, poison oak, and poison sumac grow in wooded or marshy areas throughout North America. They have a sticky, long-lasting oil called urushiol that causes an itchy, blistering rash after it touches your skin. […] Urushiol begins to stick within minutes. If you know you’ve made contact with poison ivy, oak, or sumac, wash the area with lukewarm water and soap ASAP. […] Most people — about 85% — are allergic to urushiol. You can be affected by it at any age. […] Don’t burn poison ivy, oak, or sumac. Particles of urushiol remain in the smoke and can aggravate your eyes, nose, and respiratory tract, and can land on the skin.

• #37 Is poison ivy contagious? – Harvard Health

  https://www.health.harvard.edu/staying-healthy/is-poison-ivy-contagious

  Poison ivy rashes are not contagious. You will get a rash from poison ivy only if you come into contact with urushiol oil, which is the plant oil in poison ivy that triggers the rash. […] The rash only occurs on parts of the body that were actually exposed to the plant oil. Poison ivy rashes can appear to spread if urushiol oil is trapped under your fingernails and you scratch an itch. […] You can get it from clothing or other items that have the plant oil on them. For example, the clothes your spouse was wearing that came into contact with the poison ivy plant. Poison ivy oil can cling to garden tools or even pet fur. The oil from poison ivy is known to linger. According to the FDA, it can stick around on surfaces, sometimes for years, until it is washed away using water or rubbing alcohol.

• #38 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  Symptoms may be more severe in people who have had a significant allergic reaction to poison ivy in the past. […] Note that antihistamines (drugs used to treat allergies) do not directly affect allergic reactions to poison ivy. These drugs aim to reduce or eliminate the effects of histamine, but the poison ivy does not cause the release of this substance. […] The urushiol in the sap, which is responsible for allergic reactions, is an oily substance that does not evaporate. It can therefore remain poisonous for several months.

• #39 Poison ivy rash – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poison-ivy/symptoms-causes/syc-20376485

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #40 Poison ivy rash: Causes, treatment, and prevention

  https://www.medicalnewstoday.com/articles/265375

  Poison ivy is a plant that can cause severe inflammation of the skin, or contact dermatitis. The plant contains a sap that triggers delayed irritation if it comes into contact with the skin. […] Poison ivy contains urushiol, an oil that can cause a rash on human skin. Poison ivy sap is present in nearly every part of the plant, including the leaves, stems, and roots. […] The sap contains an oil called urushiol, which is a pale yellow, sticky, oily substance that is also present in poison oak and poison sumac. […] If any of this oil touches the skin, a blistering skin rash can develop. […] A person can react to urushiol after touching the plant, touching contaminated objects, such as shoes that have come into contact with the plant, or breathing in smoke from burning poison ivy. […] The most dangerous type of exposure is when a person inhales the smoke from a burning plant.

• #41 Poison Ivy, Sumac & Oak – Pariser Dermatology

  https://pariserderm.com/services/common-concerns/poison-ivy-sumac-oak/

  Rash from poison ivy. Many people develop an itchy rash that causes lines or streaks that look like this. […] Many people get a rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all). The itchy, blistering rash often does not start until 12 to 72 hours after you come into contact with the oil. […] The rash is not contagious and does not spread. It might seem to spread, but this is a delayed reaction. […] All parts of these plants contain urushiol. The leaves, the stems, and even the roots contain urushiol. Touching any part of the plant can cause an allergic reaction. […] Touching anything that has urushiol on it can cause an allergic reaction. You can have an allergic reaction from touching gardening tools, sporting equipment, and even a pet’s fur. […] Burning these plants releases urushiol into the air. You can have an allergic reaction if airborne particles land on your skin.

• #42 Poison ivy rash | Beacon Health System

  https://www.beaconhealthsystem.org/library/diseases-and-conditions/poison-ivy-rash?content_id=CON-20376467

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oil is in the leaves, stems and roots of poison ivy, poison oak and poison sumac. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. You might then transfer it to your face or body by touching or rubbing. If the contaminated object isn’t cleaned, the urushiol on it can still cause a skin reaction years later. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #43 Poison Ivy – Causes | Symptoms | Diagnosis | Treatment | Prevention

  https://www.icliniq.com/articles/skin-care/poison-ivy

  Poison ivy, otherwise called Toxicodendron radicans, is a poisonous flowering plant commonly found in Asia and North America. It is known to cause urushiol-induced contact dermatitis, which results in painful and itchy rashes in people who come in contact with this plant. This allergic reaction is caused by urushiol, which is a clear, odorless, and sticky liquid found in the plant’s sap. […] The sap of this plant, which is present in the leaves, stems, and roots, causes this allergic reaction. This sap contains urushiol, which is a pale yellow oil and is also present in poison oak and poison sumac. […] When this oil touches the skin, it causes the skin to blister. An allergic reaction can result from: Touching the Plant – It includes touching the leaves, stem, roots, or berries. Touching Things That Have Come in Contact With the Plant – Pet fur, clothes, shoes, or other equipment. Breathing in Smoke When This Plant Is Burned – Inhaling the smoke is the most severe type of exposure. It can irritate your nasal passage and lungs, resulting in breathing problems.

• #44 Poison Ivy Rash: Pictures, Symptoms, and Treatment

  https://www.healthline.com/health/outdoor-health/poison-ivy-pictures-remedies

  A severe poison ivy allergy causes severe swelling, difficulty breathing, and blisters that become inflamed and infected. […] A poison ivy rash is bothersome. The itching and swelling can be irritating. Rarely, a poison ivy rash can be serious or fatal. When this happens, it’s often the result of complications caused by the reaction. […] Complications of a poison ivy rash include a bacterial infection, irritation in the lungs, and the potential for death if breathing or swallowing difficulties occur after contact with poison ivy.

• #45 Poison Ivy – Causes | Symptoms | Diagnosis | Treatment | Prevention

  https://www.icliniq.com/articles/skin-care/poison-ivy

  The rash typically develops in a straight line where the plant brushed against the skin. Rash from wearing a cloth that has been contaminated with urushiol will result in a more widespread rash. The allergic reaction to urushiol develops 12 to 48 hours after exposure. This rash can last up to a couple of weeks or more. The healing time depends on the amount of urushiol that got inside your skin. […] The complications include: Infection – The blister or rash can get infected and start oozing pus. Get immediate medical help if this happens, because you will need treatment with antibiotics. Breathing Problems – Inhaling the smoke of burning poison ivy can irritate your airway and lungs. The Spread of Rash – Urushiol can remain in your hands, pets fur, clothing, and gardening equipment, which can spread if it comes in contact with your skin. Death – Breathing difficulties and swelling if not treated immediately might result in fatal complications.

• #46 Poison Ivy, Oak, & Sumac: Allergic Reactions and Prevention

  https://www.webmd.com/skin-problems-and-treatments/understanding-poison-ivy-oak-sumac-basics

  Poison ivy, poison oak, and poison sumac are all plants that can cause a temporary, irritating rash when they come in contact with your skin. This rash is a form of allergic contact dermatitis. […] Up to 85% of Americans are allergic to poison ivy, leaving at least 15% resistant to any reaction. […] If you are allergic to poison ivy, you’re more likely to be allergic to poison oak and poison sumac, because all three plants contain the same rash-triggering plant oil called urushiol. […] Many people break out in a rash when urushiol touches the skin. […] Urushiol quickly penetrates the skin, often leaving red lines that show where you brushed against the plant. […] Symptoms appear 24 to 72 hours after exposure. […] Three types of transmission can occur: Direct contact with the plant, Indirect contact when you touch pets, gardening tools, sports equipment, or other objects that had direct contact with the plant, Airborne contact from burning these plants, which releases particles of urushiol into the air that can penetrate the skin, eyes, nose, throat, or respiratory system. […] Poison ivy, oak, and sumac all fall into the plant genus called Toxicodendron, so the allergic reaction to all of these plants has the same name: Toxicodendron dermatitis. […] All four plants contain urushiol, so the skin reaction and treatment are essentially the same.

• #47 Poison Ivy, Oak and Sumac: Pictures of Rashes & Plants

  https://www.webmd.com/allergies/ss/slideshow-poison-plants

  Poison ivy, poison oak, and poison sumac grow in wooded or marshy areas throughout North America. They have a sticky, long-lasting oil called urushiol that causes an itchy, blistering rash after it touches your skin. […] Urushiol begins to stick within minutes. If you know you’ve made contact with poison ivy, oak, or sumac, wash the area with lukewarm water and soap ASAP. […] Most people — about 85% — are allergic to urushiol. You can be affected by it at any age. […] Don’t burn poison ivy, oak, or sumac. Particles of urushiol remain in the smoke and can aggravate your eyes, nose, and respiratory tract, and can land on the skin.

• #48 Having a Poison Ivy Reaction | DCSI Florida DermatologyHaving a Poison Ivy Reaction | DCSI Florida Dermatology

  https://www.mydcsi.com/conditions/skin/inflammatory-skin/poison-ivy-reaction/

  If a person has a bad reaction to poison ivy, they may experience severe symptoms beyond the typical rash and itching. […] A systemic poison ivy reaction occurs when the urushiol oil from poison ivy is absorbed into the bloodstream, causing an allergic reaction throughout the body rather than just at the site of contact. […] Sensitivity to urushiol, the oil in poison ivy that causes the allergic reaction, varies among individuals, and not everyone reacts to this substance. Approximately 85% of people are allergic to urushiol and will develop a rash upon contact. However, about 15% of people are naturally resistant to urushiol and may not experience any reaction, including the typical rash or other symptoms of contact dermatitis, even after exposure.

• #49 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  When skin comes into contact with poison ivy sap, a painful allergic reaction called contact dermatitis or Rhus dermatitis may occur. […] The substance that causes this allergic reaction is urushiol, a compound in the poison ivy sap. […] About 9 in 10 people are sensitive to poison ivy sap. They react to even minute quantities of urushiol. […] The symptoms of an allergic reaction to poison ivy usually appear 24 to 48 hours after contact with the sap. […] The first sign of an allergic reaction to poison ivy is a strong itching with redness at the site of contact. […] The seriousness of an allergic reaction depends on: The persons degree of sensitivity, The amount of sap that comes into contact with the skin, The area of the body affected. […] The most serious allergic reactions affect areas of the body where the skin is thin, like the face and the genitals.

• #50 Poison Ivy, Oak, & Sumac: Allergic Reactions and Prevention

  https://www.webmd.com/skin-problems-and-treatments/understanding-poison-ivy-oak-sumac-basics

  Poison ivy, poison oak, and poison sumac are all plants that can cause a temporary, irritating rash when they come in contact with your skin. This rash is a form of allergic contact dermatitis. […] Up to 85% of Americans are allergic to poison ivy, leaving at least 15% resistant to any reaction. […] If you are allergic to poison ivy, you’re more likely to be allergic to poison oak and poison sumac, because all three plants contain the same rash-triggering plant oil called urushiol. […] Many people break out in a rash when urushiol touches the skin. […] Urushiol quickly penetrates the skin, often leaving red lines that show where you brushed against the plant. […] Symptoms appear 24 to 72 hours after exposure. […] Three types of transmission can occur: Direct contact with the plant, Indirect contact when you touch pets, gardening tools, sports equipment, or other objects that had direct contact with the plant, Airborne contact from burning these plants, which releases particles of urushiol into the air that can penetrate the skin, eyes, nose, throat, or respiratory system. […] Poison ivy, oak, and sumac all fall into the plant genus called Toxicodendron, so the allergic reaction to all of these plants has the same name: Toxicodendron dermatitis. […] All four plants contain urushiol, so the skin reaction and treatment are essentially the same.

• #51 Having a Poison Ivy Reaction | DCSI Florida DermatologyHaving a Poison Ivy Reaction | DCSI Florida Dermatology

  https://www.mydcsi.com/conditions/skin/inflammatory-skin/poison-ivy-reaction/

  If a person has a bad reaction to poison ivy, they may experience severe symptoms beyond the typical rash and itching. […] A systemic poison ivy reaction occurs when the urushiol oil from poison ivy is absorbed into the bloodstream, causing an allergic reaction throughout the body rather than just at the site of contact. […] Sensitivity to urushiol, the oil in poison ivy that causes the allergic reaction, varies among individuals, and not everyone reacts to this substance. Approximately 85% of people are allergic to urushiol and will develop a rash upon contact. However, about 15% of people are naturally resistant to urushiol and may not experience any reaction, including the typical rash or other symptoms of contact dermatitis, even after exposure.

• #52 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  Symptoms may be more severe in people who have had a significant allergic reaction to poison ivy in the past. […] Note that antihistamines (drugs used to treat allergies) do not directly affect allergic reactions to poison ivy. These drugs aim to reduce or eliminate the effects of histamine, but the poison ivy does not cause the release of this substance. […] The urushiol in the sap, which is responsible for allergic reactions, is an oily substance that does not evaporate. It can therefore remain poisonous for several months.

• #53

  https://tecnu.com/a/docs/guides-how-tos/how-does-poison-ivy-work?srsltid=AfmBOoomdUMueYkYLkOSSD3Vp38KGzyTnjntTISGWl8Qd4i58R5td2OT

  Once urushiol touches your skin, it starts to penetrate almost immediately. Within 8 hours, you may begin to notice a red, swollen rash that can blister and become extremely itchy. The severity of the reaction depends on the amount of urushiol that contacts the skin and individual sensitivity. […] The truth is, the rash itself isn’t contagious. You can’t catch poison ivy from someone else unless you touch the urushiol on their skin, clothing, or other items they’ve come into contact with.

• #54 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  When skin comes into contact with poison ivy sap, a painful allergic reaction called contact dermatitis or Rhus dermatitis may occur. […] The substance that causes this allergic reaction is urushiol, a compound in the poison ivy sap. […] About 9 in 10 people are sensitive to poison ivy sap. They react to even minute quantities of urushiol. […] The symptoms of an allergic reaction to poison ivy usually appear 24 to 48 hours after contact with the sap. […] The first sign of an allergic reaction to poison ivy is a strong itching with redness at the site of contact. […] The seriousness of an allergic reaction depends on: The persons degree of sensitivity, The amount of sap that comes into contact with the skin, The area of the body affected. […] The most serious allergic reactions affect areas of the body where the skin is thin, like the face and the genitals.

• #55 Allergic reactions caused by poison ivy | Gouvernement du Québec

  https://www.quebec.ca/en/health/health-issues/a-z/allergic-reactions-caused-by-poison-ivy

  When skin comes into contact with poison ivy sap, a painful allergic reaction called contact dermatitis or Rhus dermatitis may occur. […] The substance that causes this allergic reaction is urushiol, a compound in the poison ivy sap. […] About 9 in 10 people are sensitive to poison ivy sap. They react to even minute quantities of urushiol. […] The symptoms of an allergic reaction to poison ivy usually appear 24 to 48 hours after contact with the sap. […] The first sign of an allergic reaction to poison ivy is a strong itching with redness at the site of contact. […] The seriousness of an allergic reaction depends on: The persons degree of sensitivity, The amount of sap that comes into contact with the skin, The area of the body affected. […] The most serious allergic reactions affect areas of the body where the skin is thin, like the face and the genitals.

• #56 Urushiol-induced contact dermatitis – Wikipedia

  https://en.wikipedia.org/wiki/Urushiol-induced_contact_dermatitis

  Urushiol-induced contact dermatitis is a type of allergic contact dermatitis caused by the oil urushiol found in various plants, most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. […] Urushiol-induced contact dermatitis is caused by contact with a plant or any other object containing urushiol oil. […] The oil adheres to almost anything with which it comes in contact, such as towels, blankets, clothing, and landscaping tools. […] For people who have never been exposed or are not yet allergic to urushiol, it may take 10 to 21 days for a reaction to occur the first time. […] Once allergic to urushiol, however, most people break out 48 to 72 hours after contact with the oil. […] Urushiol is primarily found in the spaces between cells beneath the outer skin of the plant, so the effects are less severe if the plant tissue remains undamaged on contact. […] Although simple skin exposure is most common, ingestion of urushiol can lead to serious, systemic reactions. […] Burning plant material is commonly said to create urushiol-laden smoke that causes a systemic reaction, as well as a rash in the throat and eyes.

• #57 Poison Ivy, Oak and Sumac: Pictures of Rashes & Plants

  https://www.webmd.com/allergies/ss/slideshow-poison-plants

  Poison ivy, poison oak, and poison sumac grow in wooded or marshy areas throughout North America. They have a sticky, long-lasting oil called urushiol that causes an itchy, blistering rash after it touches your skin. […] Urushiol begins to stick within minutes. If you know you’ve made contact with poison ivy, oak, or sumac, wash the area with lukewarm water and soap ASAP. […] Most people — about 85% — are allergic to urushiol. You can be affected by it at any age. […] Don’t burn poison ivy, oak, or sumac. Particles of urushiol remain in the smoke and can aggravate your eyes, nose, and respiratory tract, and can land on the skin.

• #58 Outsmarting Poison Ivy and Other Poisonous Plants | FDA

  https://www.fda.gov/consumers/consumer-updates/outsmarting-poison-ivy-and-other-poisonous-plants

  First comes the itching, then a red rash, and then blisters. These symptoms of poison ivy, poison oak, and poison sumac can emerge any time from a few hours to several days after exposure to the plant oil found in the sap of these poisonous plants. The culprit: the urushiol oil. […] Poison ivy and other poison plant rashes cant be spread from person to person. But it is possible to pick up the rash from plant oil that may have stuck to clothing, pets, garden tools, and other items that have come in contact with these plants. The plant oil lingers (sometimes for years) on virtually any surface until its washed off with water or rubbing alcohol. […] The rash will occur only where the plant oil has touched the skin, so a person with poison ivy cant spread it on the body by scratching. It may seem like the rash is spreading if it appears over time instead of all at once. But this is either because the plant oil is absorbed at different rates on different parts of the body or because of repeated exposure to contaminated objects or plant oil trapped under the fingernails. Even if blisters break, the fluid in the blisters is not plant oil and cannot further spread the rash.

• #59 What Is Poison Ivy? Symptoms, Causes, Diagnosis, Treatment, and Prevention

  https://www.everydayhealth.com/poison-ivy/guide/

  Poison ivy isnt contagious unless there is still oil from the plant on your skin and you spread it to other surfaces. You also cant spread a rash across your body by scratching once youve washed off the oil. […] If a skin rash appears to spread, its probably because the area was already exposed and its experiencing a delayed reaction. Or you may have oil from the plant under your fingernails, or youve unknowingly touched a contaminated item.

• #60 Poison ivy – oak – sumac rash Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/injury/poison-ivy-oak-sumac-rash

  Poison ivy, oak, and sumac are plants that commonly cause an allergic skin reaction. This is also called an allergic contact dermatitis. The result is most often an itchy, red rash with bumps or blisters. […] The rash is caused by skin contact with the oils (resin) of certain plants. The oils most often enter the skin rapidly. […] This is one of the most frequent causes of skin rash among children and adults who spend time outdoors. […] The rash does not spread by the fluid from the blisters. Therefore, once a person has washed the oil off the skin, the rash does not often spread from person to person. […] Smoke from burning these plants can cause the same reaction.

• #61 Poison Ivy, Oak, and Sumac Rash | Cedars-Sinai

  https://www.cedars-sinai.org/health-library/diseases-and-conditions/p/poison-ivy-oak-and-sumac-rash.html

  Poison ivy, poison oak, and poison sumac are types of American plants. They each grow in different parts of the country. The plants cause allergic contact dermatitis in most people who touch them. The rash is caused by the bodys reaction to an oil in the plants called urushiol. […] The plants make an oil called urushiol. This oil gets on your skin if you touch the plants. And its easily spread from the plants to other objects. These include garden tools, clothing, toys, and pet fur. You can also inhale it from smoke if the plants are burned. Urushiol can stay active on any surface for a year or more and still cause skin rash. The rash doesnt show up right away. But you can spread the oils around your body without knowing it. […] Poison ivy, oak, and sumac rash is not contagious. It cant be spread from person to person by touching the blisters, or from the fluid inside the blisters. But oil that remains on skin, clothes, or shoes can be spread to another person and cause a rash. […] The rash is caused by a reaction to an oil in the plants called urushiol.

• #62 Poison Ivy/Poison Oak – Conditions – Pediatric Allergy/Immunology – Golisano Children’s Hospital – University of Rochester Medical Center

  https://www.urmc.rochester.edu/childrens-hospital/allergy/poison-ivy-poison-oak

  Poison ivy rash is an itchy, allergic reaction to poison ivy. […] Poison ivy has an oil called urushiol. This oil causes the allergic skin reaction. […] Poison ivy, oak, and sumac cause an allergic skin reaction. The reaction is caused by oil from the plant. […] The fluid from the blisters doesnt make poison ivy spread. But oil on the skin can cause a rash if wiped on another person.

• #63 Outsmarting Poison Ivy and Other Poisonous Plants | FDA

  https://www.fda.gov/consumers/consumer-updates/outsmarting-poison-ivy-and-other-poisonous-plants

  First comes the itching, then a red rash, and then blisters. These symptoms of poison ivy, poison oak, and poison sumac can emerge any time from a few hours to several days after exposure to the plant oil found in the sap of these poisonous plants. The culprit: the urushiol oil. […] Poison ivy and other poison plant rashes cant be spread from person to person. But it is possible to pick up the rash from plant oil that may have stuck to clothing, pets, garden tools, and other items that have come in contact with these plants. The plant oil lingers (sometimes for years) on virtually any surface until its washed off with water or rubbing alcohol. […] The rash will occur only where the plant oil has touched the skin, so a person with poison ivy cant spread it on the body by scratching. It may seem like the rash is spreading if it appears over time instead of all at once. But this is either because the plant oil is absorbed at different rates on different parts of the body or because of repeated exposure to contaminated objects or plant oil trapped under the fingernails. Even if blisters break, the fluid in the blisters is not plant oil and cannot further spread the rash.

• #64 Poison Ivy Rash, Poison Oak, Poison Sumac: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/10655-poison-plants-poison-ivy–poison-oak–poison-sumac

  Poison oak rash and poison sumac rash look the same as poison ivy rash. This is because urushiol oil causes the same allergic reaction no matter which poisonous plant you touch. […] No matter how long it takes for a rash to appear, it usually comes in stages and peaks within one to 14 days of exposure. However, symptoms can develop as long as 21 days after initial exposure to urushiol oil for those whove never been in contact with it before. […] It may look like your rash is spreading, but youre actually developing new rashes on areas of skin that came into contact with urushiol oil. […] You cant get a poison ivy rash by touching another persons rash. But you could develop a rash if you touch the oil on another persons body or clothes. […] Some situations increase your risk of problems if youre exposed to poison ivy, poison oak or poison sumac. These factors include: Inhaling smoke: When poisonous plants burn, they release urushiol into the air.

• #65 What Is Poison Ivy? Symptoms, Causes, Diagnosis, Treatment, and Prevention

  https://www.everydayhealth.com/poison-ivy/guide/

  Poison ivy isnt contagious unless there is still oil from the plant on your skin and you spread it to other surfaces. You also cant spread a rash across your body by scratching once youve washed off the oil. […] If a skin rash appears to spread, its probably because the area was already exposed and its experiencing a delayed reaction. Or you may have oil from the plant under your fingernails, or youve unknowingly touched a contaminated item.

• #66 Outsmarting Poison Ivy and Other Poisonous Plants | FDA

  https://www.fda.gov/consumers/consumer-updates/outsmarting-poison-ivy-and-other-poisonous-plants

  First comes the itching, then a red rash, and then blisters. These symptoms of poison ivy, poison oak, and poison sumac can emerge any time from a few hours to several days after exposure to the plant oil found in the sap of these poisonous plants. The culprit: the urushiol oil. […] Poison ivy and other poison plant rashes cant be spread from person to person. But it is possible to pick up the rash from plant oil that may have stuck to clothing, pets, garden tools, and other items that have come in contact with these plants. The plant oil lingers (sometimes for years) on virtually any surface until its washed off with water or rubbing alcohol. […] The rash will occur only where the plant oil has touched the skin, so a person with poison ivy cant spread it on the body by scratching. It may seem like the rash is spreading if it appears over time instead of all at once. But this is either because the plant oil is absorbed at different rates on different parts of the body or because of repeated exposure to contaminated objects or plant oil trapped under the fingernails. Even if blisters break, the fluid in the blisters is not plant oil and cannot further spread the rash.

• #67 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics/print

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #68 Poison Ivy 101: Symptoms, Treatments, & Prevention – Medical Associates of Northwest Arkansas

  https://mana.md/poison-ivy-101/

  Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year […] By touching something that has urushiol on it, such as animal fur or garden tools […] By breathing in smoke when toxic plants are burned […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis. […] Poison ivy dermatitis is not contagious and cannot be passed from person to person. However, urushiol can be carried under fingernails and on clothes. If another person comes in contact with the urushiol, he or she can develop poison ivy dermatitis.

• #69 Urushiol-induced contact dermatitis – Wikipedia

  https://en.wikipedia.org/wiki/Urushiol-induced_contact_dermatitis

  Urushiol-induced contact dermatitis is a type of allergic contact dermatitis caused by the oil urushiol found in various plants, most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. […] Urushiol-induced contact dermatitis is caused by contact with a plant or any other object containing urushiol oil. […] The oil adheres to almost anything with which it comes in contact, such as towels, blankets, clothing, and landscaping tools. […] For people who have never been exposed or are not yet allergic to urushiol, it may take 10 to 21 days for a reaction to occur the first time. […] Once allergic to urushiol, however, most people break out 48 to 72 hours after contact with the oil. […] Urushiol is primarily found in the spaces between cells beneath the outer skin of the plant, so the effects are less severe if the plant tissue remains undamaged on contact. […] Although simple skin exposure is most common, ingestion of urushiol can lead to serious, systemic reactions. […] Burning plant material is commonly said to create urushiol-laden smoke that causes a systemic reaction, as well as a rash in the throat and eyes.

• #70 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] By touching something that has urushiol on it, such as animal fur or garden tools. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #71 Poison Ivy 101: Symptoms, Treatments, & Prevention – Medical Associates of Northwest Arkansas

  https://mana.md/poison-ivy-101/

  Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year […] By touching something that has urushiol on it, such as animal fur or garden tools […] By breathing in smoke when toxic plants are burned […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis. […] Poison ivy dermatitis is not contagious and cannot be passed from person to person. However, urushiol can be carried under fingernails and on clothes. If another person comes in contact with the urushiol, he or she can develop poison ivy dermatitis.

• #72 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics/print

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #73 Poison Ivy 101: Symptoms, Treatments, & Prevention – Medical Associates of Northwest Arkansas

  https://mana.md/poison-ivy-101/

  Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year […] By touching something that has urushiol on it, such as animal fur or garden tools […] By breathing in smoke when toxic plants are burned […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis. […] Poison ivy dermatitis is not contagious and cannot be passed from person to person. However, urushiol can be carried under fingernails and on clothes. If another person comes in contact with the urushiol, he or she can develop poison ivy dermatitis.

• #74 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] By touching something that has urushiol on it, such as animal fur or garden tools. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #75 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Plants within the Anacardiaceae family cause Toxicodendron toxicity. It includes plants such as poison ivy, poison oak, poison sumac and is the most common cause of allergic dermatitis in North America. […] Toxicodendron dermatitis is the most common cause of allergic contact dermatitis in North America and is caused by skin exposure to urushiol, producing a type IV hypersensitivity reaction. […] It is estimated that 50 to 75% of adults are allergic to urushiol. […] A large portion of the population is sensitized to urushiol. […] Urushiol is the primary allergenic cause of contact dermatitis and is typically encountered by brushing up against damaged stems or leaves. […] Initial exposure results in pruritus and erythema, followed by a papulovesicular eruption, edema, and oozing within 10 to 14 days.

• #76 Toxicodendron Contact Dermatitis: A Case Report and Brief Review

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7733371/

  Contact dermatitis caused by the sap of plants from the Anacardiaceae family, including poison ivy, oak, and sumac, is among the most common skin conditions in the United States. […] The patient was diagnosed with Toxicodendron contact dermatitis caused by exposure to poison ivy. […] Toxicodendron contact dermatitis (TCD) is a highly pruritic papulovesicular eruption that represents a Type-IV delayed hypersensitivity reaction triggered by contact with the sap of plants from the Anacardiaceae family, which includes poison ivy (the most common), oak, and sumac. […] Sap from the injured leaves, stems, and berries of these plants contain an oily resin called urushiol, to which 85 to 90 percent of adults are allergic. […] Exposure to urushiol can result in an intensely pruritic and potentially blistery rash that can persist for weeks regardless of treatment, and each additional exposure to urushiol can cause increasingly severe skin reactions.

• #77 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Plants within the Anacardiaceae family cause Toxicodendron toxicity. It includes plants such as poison ivy, poison oak, poison sumac and is the most common cause of allergic dermatitis in North America. […] Toxicodendron dermatitis is the most common cause of allergic contact dermatitis in North America and is caused by skin exposure to urushiol, producing a type IV hypersensitivity reaction. […] It is estimated that 50 to 75% of adults are allergic to urushiol. […] A large portion of the population is sensitized to urushiol. […] Urushiol is the primary allergenic cause of contact dermatitis and is typically encountered by brushing up against damaged stems or leaves. […] Initial exposure results in pruritus and erythema, followed by a papulovesicular eruption, edema, and oozing within 10 to 14 days.

• #78 10 Things to Know About Poison Ivy Rash

  https://mydoctor.kaiserpermanente.org/mas/news/10-things-to-know-about-poison-ivy-rash-2184009

  You may have been exposed to poison ivy, which causes tens of millions of people to have poison ivy rash each year. […] Poison ivy rash—also called poison ivy dermatitis—is caused by contact with a sticky oil called urushiol. You can get the rash from directly touching a poison ivy plant, touching anything that has come in contact with a poison ivy plant or being exposed to smoke from burning these plants. […] The rash usually doesn’t show up immediately after exposure to urushiol. People have what is called a delayed hypersensitivity reaction. The rash may show up more than a week after the first exposure to the oil but may appear within 12-48 hours following subsequent exposures. […] Symptoms of poison ivy rash include itching, hives, and blisters. The rash usually appears as red streaks in the area where the oil touched the skin. […] If a bacterial infection develops, we may also prescribe antibiotics.

• #79 Thinking Big about Poison Ivy – Rhody Today

  https://www.uri.edu/news/2013/08/thinking-big-about-poison-ivy/

  Poison Ivy, Sumac and Oak are the most common cause of allergic reaction in the United States. These are plants in the Toxicodendron genus. […] The symptoms are caused by a chemical, urushiol, present in the sap. This is easily contacted from damaged or broken plants, even from dead or decaying plant material or from surfaces that have contacted the chemical, such as clothing, tools and pets. […] The rash can occur from a few hours after exposure up to many days later depending on previous exposures and reactions. Symptoms can continue to develop/persist for up to 21 days. […] The vesicles (blisters) of Poison Ivy dermatitis can become infected and require treatment with antibiotics. Inhaled smoke from burning plants can cause lung irritation and severe respiratory symptoms. Rarely, the immune reaction to urushiol can cause kidney damage.

• #80 Poison Ivy – Causes | Symptoms | Diagnosis | Treatment | Prevention

  https://www.icliniq.com/articles/skin-care/poison-ivy

  The rash typically develops in a straight line where the plant brushed against the skin. Rash from wearing a cloth that has been contaminated with urushiol will result in a more widespread rash. The allergic reaction to urushiol develops 12 to 48 hours after exposure. This rash can last up to a couple of weeks or more. The healing time depends on the amount of urushiol that got inside your skin. […] The complications include: Infection – The blister or rash can get infected and start oozing pus. Get immediate medical help if this happens, because you will need treatment with antibiotics. Breathing Problems – Inhaling the smoke of burning poison ivy can irritate your airway and lungs. The Spread of Rash – Urushiol can remain in your hands, pets fur, clothing, and gardening equipment, which can spread if it comes in contact with your skin. Death – Breathing difficulties and swelling if not treated immediately might result in fatal complications.

• #81 Having a Poison Ivy Reaction | DCSI Florida DermatologyHaving a Poison Ivy Reaction | DCSI Florida Dermatology

  https://www.mydcsi.com/conditions/skin/inflammatory-skin/poison-ivy-reaction/

  If a person has a bad reaction to poison ivy, they may experience severe symptoms beyond the typical rash and itching. […] A systemic poison ivy reaction occurs when the urushiol oil from poison ivy is absorbed into the bloodstream, causing an allergic reaction throughout the body rather than just at the site of contact. […] Sensitivity to urushiol, the oil in poison ivy that causes the allergic reaction, varies among individuals, and not everyone reacts to this substance. Approximately 85% of people are allergic to urushiol and will develop a rash upon contact. However, about 15% of people are naturally resistant to urushiol and may not experience any reaction, including the typical rash or other symptoms of contact dermatitis, even after exposure.

• #82 Thinking Big about Poison Ivy – Rhody Today

  https://www.uri.edu/news/2013/08/thinking-big-about-poison-ivy/

  Poison Ivy, Sumac and Oak are the most common cause of allergic reaction in the United States. These are plants in the Toxicodendron genus. […] The symptoms are caused by a chemical, urushiol, present in the sap. This is easily contacted from damaged or broken plants, even from dead or decaying plant material or from surfaces that have contacted the chemical, such as clothing, tools and pets. […] The rash can occur from a few hours after exposure up to many days later depending on previous exposures and reactions. Symptoms can continue to develop/persist for up to 21 days. […] The vesicles (blisters) of Poison Ivy dermatitis can become infected and require treatment with antibiotics. Inhaled smoke from burning plants can cause lung irritation and severe respiratory symptoms. Rarely, the immune reaction to urushiol can cause kidney damage.

• #83 Toxicodendron Contact Dermatitis: A Case Report and Brief Review

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7733371/

  The oily resin present in all parts of the plants is called urushiol, an allergen that is a major cause of contact dermatitis in the United States, to which around 85 percent of the population is sensitive. […] Patients should be made aware that Toxicodendron contact dermatitis can even be triggered by handling dead or dried plant parts. […] More effective treatments include topical and/or systemic steroids and the use of aluminum acetate solution (Burow solution). […] The rash caused by contact with the leaves, stems, or berries of these plants is highly pruritic, can last for weeks, and can have a substantially negative impact on a patient’s quality of life, including loss of sleep and missed work days.

• #84 Toxicodendron Contact Dermatitis: A Case Report and Brief Review

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7733371/

  Currently available treatments for TCD are unsatisfactory, often only slightly easing the symptoms while the condition slowly fades on its own. […] This article describes the case of a middle-aged man who developed severe TCD following exposure to poison ivy. […] Approximately 50 to 75 percent of the US adult population is clinically sensitive to poison ivy, oak, and sumac. […] The cutaneous reaction usually begins 12 to 72 hours after contact with the plant, manifesting with intense itching that is often accompanied by the formation of vesicles or bullae, which tend to present in linear configurations following the pattern of contact made by plants leaves, berries, stems, or vines. […] Key to preventing TCD is the ability to recognize these plants and, thus, avoid contact with them.

• #85 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Plants within the Anacardiaceae family cause Toxicodendron toxicity. It includes plants such as poison ivy, poison oak, poison sumac and is the most common cause of allergic dermatitis in North America. […] Toxicodendron dermatitis is the most common cause of allergic contact dermatitis in North America and is caused by skin exposure to urushiol, producing a type IV hypersensitivity reaction. […] It is estimated that 50 to 75% of adults are allergic to urushiol. […] A large portion of the population is sensitized to urushiol. […] Urushiol is the primary allergenic cause of contact dermatitis and is typically encountered by brushing up against damaged stems or leaves. […] Initial exposure results in pruritus and erythema, followed by a papulovesicular eruption, edema, and oozing within 10 to 14 days.

• #86 Poison Ivy and the Immune System | HowStuffWorks

  https://science.howstuffworks.com/life/botany/poison-ivy2.htm

  The rash caused by poison ivy often is red and sometimes causes blisters. […] But when urushiol from the poison ivy plant touches the skin, it instigates an immune response, called dermatitis, to what would otherwise be a harmless substance. […] Urushiol makes its way down through the skin, where it is metabolized, or broken down. […] Immune cells called T lymphocytes (or T-cells) recognize the urushiol derivatives as a foreign substance, or antigen. […] The allergic reaction to poison ivy is known as delayed hypersensitivity. […] Most people don’t have a reaction the first time they touch poison ivy, but develop an allergic reaction after repeated exposure. […] Sensitivity usually decreases with age and with repeat exposures to the plant.

• #87 Poison ivy rash – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poison-ivy/symptoms-causes/syc-20376485

  Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oily resin is very sticky, so it easily attaches to your skin, clothing, tools, equipment and pet’s fur. […] Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol. It’s found in poison ivy, poison oak and poison sumac. You can get a poison ivy reaction from: […] Touching the plant. If you touch the leaves, stem, roots or berries of the plant, you may have a reaction. […] Touching contaminated objects. If you walk through some poison ivy and then later touch your shoes, you might get urushiol on your hands. […] Inhaling smoke from the burning plants. Even the smoke from burning poison ivy, poison oak and poison sumac can irritate or harm your nasal passages or lungs.

• #88 Patient education: Poison ivy (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/poison-ivy-beyond-the-basics/print

  When the skin comes in direct contact with an irritating or allergy-causing substance, contact dermatitis can develop. Exposure to poison ivy, poison oak, and poison sumac causes more cases of allergic contact dermatitis than all other plant families combined. […] Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant. […] There are several ways that you can be exposed to urushiol: By touching the sap or rubbing against the leaves of the toxic plant at any time of year. […] Exposure to smoke from burning toxic plants. […] Ginkgo fruit and the skin of mangoes also contain urushiol and can produce symptoms similar to poison ivy dermatitis.

• #89 3 Causes of Poison Ivy & How To Treat It | Vujevich Dermatology

  https://www.vucare.com/2019/09/20/causes-of-poison-ivy/

  There are three causes to how poison ivy starts. These are direct contact, indirect contact, and airborne contact. […] Direct Contact is exactly as it sounds and is the most common way to contract the rash. This happens by touching poison ivy, oak, or sumac. Every part of the plant contains the oil. […] Indirect Contact occurs when you touch something that has urushiol oil on it. The oil sticks to most things, including a pets fur, gardening tools, and sports equipment. […] Airborne Contact occurs when the oil is spread through the air and lands on the skin. This can happen when poisonous leaves are burned. […] Poison ivy rash is caused by urushiol oil. Eighty to 90 percent of people exposed to 50 micrograms of urushiol (thats less than one grain of table salt!) develop a rash. But, some people see no reaction from contact with urushiol oil. […] Sensitivity to urushiol oil can change over your lifetime. Children who developed the rash as a child may completely lose their sensitivity to the oil. Likewise, adults who never had the rash as a child may develop a sensitivity to the oil.

• #90 Poison ivy, oak, and sumac: Foothill Dermatology Medical Center: Dermatology

  https://www.foothillderm.com/blog/poison-ivy-oak-and-sumac

  Rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all). […] What causes this rash? There are 3 ways to get this rash: Direct contact By touching poison ivy, poison oak, or poison sumac, you can get a rash. Every part of these plants the leaves, stems, roots, and flowers contains the oil. […] Urushiol can stick to almost anything. If you touch a pet’s fur, gardening tool, or sports equipment that has the oil on it, you can get a rash. […] Burning these poisonous plants releases particles of urushiol into the air. These airborne particles can land on the skin. […] It is not possible to get this rash from touching someone who has the rash. The skin absorbs the oil too quickly. You cannot get a rash from getting the fluid in the blisters on your skin.

• #91 Toxicodendron Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557866/

  Plants within the Anacardiaceae family cause Toxicodendron toxicity. It includes plants such as poison ivy, poison oak, poison sumac and is the most common cause of allergic dermatitis in North America. […] Toxicodendron dermatitis is the most common cause of allergic contact dermatitis in North America and is caused by skin exposure to urushiol, producing a type IV hypersensitivity reaction. […] It is estimated that 50 to 75% of adults are allergic to urushiol. […] A large portion of the population is sensitized to urushiol. […] Urushiol is the primary allergenic cause of contact dermatitis and is typically encountered by brushing up against damaged stems or leaves. […] Initial exposure results in pruritus and erythema, followed by a papulovesicular eruption, edema, and oozing within 10 to 14 days.

• #92 Poison Ivy and the Immune System | HowStuffWorks

  https://science.howstuffworks.com/life/botany/poison-ivy2.htm

  The rash caused by poison ivy often is red and sometimes causes blisters. […] But when urushiol from the poison ivy plant touches the skin, it instigates an immune response, called dermatitis, to what would otherwise be a harmless substance. […] Urushiol makes its way down through the skin, where it is metabolized, or broken down. […] Immune cells called T lymphocytes (or T-cells) recognize the urushiol derivatives as a foreign substance, or antigen. […] The allergic reaction to poison ivy is known as delayed hypersensitivity. […] Most people don’t have a reaction the first time they touch poison ivy, but develop an allergic reaction after repeated exposure. […] Sensitivity usually decreases with age and with repeat exposures to the plant.

• #93 Poison Ivy Rash, Poison Oak, Poison Sumac: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/10655-poison-plants-poison-ivy–poison-oak–poison-sumac

  Poison ivy, poison oak and poison sumac produce urushiol oil. Almost everyone is allergic to it. The oil causes an allergic reaction when it touches your skin. The itchy rash that develops is a type of allergic contact dermatitis. […] Up to 90% of people who come into contact with poison ivy oil develop an itchy rash. You dont have to be exposed to much: 50 micrograms (g) of urushiol an amount smaller than a grain of salt is enough to cause a reaction. […] Poison ivy symptoms almost always include: An itchy skin rash. Redness and swelling. Blisters. […] Poison ivy, poison oak and poison sumac produce urushiol oil. Almost everyone is allergic to it. The oil causes an allergic reaction when it touches your skin. The itchy rash that develops is a type of allergic contact dermatitis. […] Depending on your skins sensitivity, a rash may develop within a few hours or a few days after initial contact with urushiol oil. The intensity of the itching can vary, and some people may develop one or two small rashes while others develop rashes all over their bodies.

• #94 Poison ivy rash: Causes, treatment, and prevention

  https://www.medicalnewstoday.com/articles/265375

  According to the American Academy of Dermatology, 85% of the population in the United States will have an allergic reaction to poison ivy. If these people touch the plant, they will develop a rash. […] The remaining 15% may not react to poison ivy. However, even those who have never reacted to it should take care, as repeated exposure to the plant can increase the likelihood of a reaction.

• #95 Toxicodendron Contact Dermatitis: A Case Report and Brief Review

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7733371/

  The oily resin present in all parts of the plants is called urushiol, an allergen that is a major cause of contact dermatitis in the United States, to which around 85 percent of the population is sensitive. […] Patients should be made aware that Toxicodendron contact dermatitis can even be triggered by handling dead or dried plant parts. […] More effective treatments include topical and/or systemic steroids and the use of aluminum acetate solution (Burow solution). […] The rash caused by contact with the leaves, stems, or berries of these plants is highly pruritic, can last for weeks, and can have a substantially negative impact on a patient’s quality of life, including loss of sleep and missed work days.

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