POISON PLANT ALLERGIES

Poison ivy, poison oak, and poison sumac are native American plants that cause an allergic reaction in many people. The allergen is in the plants’ oils and can cause an itchy, blistery rash up to 72 hours after exposure. Before an allergic reaction to one of these plants can occur, a person must be exposed to the plant at least once prior to the instance that causes the allergic reaction. This is because the body develops the allergy by exposing the immune system to the harmful oils. When contact is made again, the immune system reacts by releasing antibodies known as histamines into the body to protect it from the harmful substance, causing the symptoms associated with these plants.

P.S. Allergic reactions to poison ivy, poison oak, and poison sumac cannot spread to others by touching the blisters, but it can be spread if the plants’ oils remain on clothing, shoes, and other items, and even  pets.

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