All about allergy

The rash caused by poison ivy, oak, and sumac is an allergic skin reaction to an oil, called urushiol, which is in the plant. This oil is found in all parts of the plant, including the leaves, stems, roots, and berries.
Exposure to the oil occurs through any of the following:
Touching any part of the plants
Touching clothing or other objects that have contacted the plants
Touching pets or other animals that have contacted the plants
Exposure to the smoke of burning plants
For more information about how these reactions occur, see Allergic Reactions and Contact Dermatitis.

Allergy journal

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