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Microbiologist John Jelesko has learned not to take any chances when he touches poison ivy. Courtesy of John Jelesko hide caption

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Courtesy of John Jelesko

Don't Touch! A Scientist's Advice For Spotting Poison Ivy Before It Ruins Your Summer

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Urushiol, the chemical in poison ivy, is also harvested from the Japanese lacquer tree to coat lacquerware. Here, a rash caused by lacquerware that likely was not properly cured. Kenji Kabashima hide caption

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Kenji Kabashima

Spray Lights Up The Chemical That Causes Poison Ivy Rash

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