Lots More Information Related Articles How Allergies WorkHow to Clear Poison Ivy17 Home Remedies for Poison IvyWhat is urushiol? More Great Links What Poison Ivy Looks LikePoison Ivy, Oak & Sumac Information CenterAmerican Academy of Dermatology: Poison Ivy, Oak & Sumac Sources "Outsmarting Poison Ivy and Its Cousins." FDA. https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm049342.htm"Poison Ivy: An Exaggerated Immune Response to Nothing Much." http://www.bio.umass.edu/micro/immunology/poisoniv.htm#pi-acdPoison Ivy Fact Sheet. U.S. Department of the Interior. http://medical.smis.doi.gov/POISON%20IVY%20FACT%20SHEET.pdfPoison Ivy FAQ. http://www.poison-ivy.org/html/faq.htmPoison Ivy, Oak & Sumac. American Academy of Dermatology. https://www.aad.org/public/diseases/itchy-skin/poison-ivy-oak-and-sumacPoison Ivy, Oak, and Sumac. Go Ask Alice, Columbia University. http://www.goaskalice.columbia.edu/answered-questions/poison-ivy-oak-and-sumacPoison Ivy, Oak and Sumac Information Center. http://poisonivy.aesir.com