Summer is here, and it's time to prepare for a little jungle warfare. Stepping into the great outdoors makes your body fair game for stinging bees, biting insects and, worst of all, the plague of poison ivy.

Nearly half of Americans are allergic to poison ivy and its 150 plant cousins, reacting with a skin rash known as allergic contact dermatitis.

You aren't allergic to poison ivy the first time you touch it — it takes about 10 to 14 days for your body to develop the alle ...

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