A member asked:

For what length of time can poison ivy spread for once the oil gets onto you?

A doctor has provided 1 answer
Dr. Lily Hwang answered

Specializes in Pediatric Allergy and Asthma

Few hours to weeks: The oil, urushiol, is what causes the symptoms. Once you come into contact with it, your symptoms may take hours up to 3 week to develop depending on the person. The oil may be carried on your clothes or under fingernails. It is not passed on from person to person and is not contagious.

Answered 6/20/2018

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