Rhus Dermatitis (Poison Ivy, Poison Oak, Poison Sumac) Description : ■ Poison ivy, poison oak, and poison sumac (plants of the Anacardiaceae family) and Toxicodendron species are the most common causes of allergic contact dermatitis in the United States; this problematic prototype of contact dermatitis is rarely reported in Europe, although related plants grow in Southeast Asia, Central America, and South America. ■ Oleoresin (lipid-soluble portion) contains a mixture of highly allergenic catechol chemicals called urushiols, a term derived from the Japanese word for sap, urushi.
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