![]() It is important to know that the oils can be passed from clothing, pets, or smoke from a burning plant. This chemical can remain active for a year or longer. Urushiol is easily passed from the plants to other objects. The resin in the plants contains an oily substance called urushiol. What causes the allergic reaction to poison ivy, poison oak, or poison sumac? But, it can be spread if the plant oils remain on the skin, clothes, or shoes. An allergic reaction can’t be spread from one person to another by touching the blisters or from the fluid inside the blisters. This means that next time contact with the plant happens, a reaction may happen 24 to 72 hours after exposure. To be allergic to poison ivy, you must come in contact with the plant once for sensitization to the oils to happen. These plants cause an allergic reaction in most people who are exposed to them. Poison ivy, poison oak, and poison sumac are native American plants. What are poison ivy, poison oak, and poison sumac?
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