Poison ivy toxin does not harm the skin on contact,but it activates T cells specific for the toxin,including formation of a memory component.

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Poison ivy toxin is not harmful to the skin on contact, but it can activate T cells that are specific to the toxin. This can cause an immune response, including the formation of a memory component, which can make a person more sensitive to the toxin in the future.

Poison Ivy Toxin Does Not Harm the Skin on Contact,but