Not everyone gets poison ivy, oak or sumac rash
According to the American Academy of Dermatology, up to 50 million people get the poison ivy or oak rash each year. However, not everyone will get the rash.
Expert opinion varies slightly as to how many people are immune to getting the rash. The estimates vary and suggest that between 3% and 15% of the population is immune to urushiol. However, even those immune people may get the rash if exposed to the plants enough.
The rash causing substance, urushiol, is in every fiber of the poison ivy or oak plant and can come into contact with skin in many ways. A person can get the urushiol on the skin by coming in “direct” contact with the plants--either by touching or rubbing against the leaves. You can also get the urushiol on the skin through “indirect” contact. For example, the urushiol may get on clothing, tools, or your pet's fur. Then, when you touch these items you end up getting the poison ivy or oak's rash causing urushiol on your skin.
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