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Q:

How long does the poison ivy rash, poison oak rash, sumac causing urushiol stay “active”?

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Urushiol can stay active for months and even years at a time. It doesn’t evaporate like something water based, so it hangs around on items like clothing and tools for a very long time. Then, if you come back in contact with that item you will be exposed to the urushiol all over again. more
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