A bed bug is displayed at the Smithsonian Institution National Museum of Natural History, Wednesday, March 30, 2011, in Washington. Spring brings people back outside just as the mosquitoes, ticks, yellow jackets and other bugs emerge to bug us. Though some can pose real threats, such as Lyme disease or life-threatening allergic reactions, most of the time bug bites in this country are just an itchy nuisance. (AP Photo/Carolyn Kaster)
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