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Summer tends to be the season that people identify as the 'worst' for poison ivy [Toxicodendron radicans] allergic reactions. But that's just because there are greater chances for human contact with the plant. In fact, urushiol oil, which is the cause of the reactions, is present in all plant body parts year round. Indeed, a fence against which poison ivy brushed may bring on an allergic reaction as much as 1-1/2 years later.

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15y ago

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