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About 15 percent of the 120 million Americans who are allergic to poison oak, poison ivy, and poison sumac are so highly sensitive that they break out ina rash and begin to swell in 4 to 12 hours instead of the normal 24 to 48. Their eyes may swell shut and...
The acute episodes, which affect some 15 percent of the population, generally last no longer than a day, or at most a week. Five percent of the population will get hives from stroking or scratching the skin.
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