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Associated Press
In this Aug. 1, 2012 photo, a sign warning people to wash their hands after being near farm animals hangs outside the Swine Barn at the Ohio State Fair, in Columbus. The Centers for Disease Control and Prevention said Thursday, Aug. 9, 2012, there's been a five-fold increase of cases of a new strain of swine flu that spreads from pigs to people, thanks to a wave of new cases confirmed in Indiana and Ohio, many of them attributed to contact at fairs. The flu does not seem to be unusually dangerous, like the strain in 2009 that killed at least 12,000. Most or all of the cases appear to have spread from pigs to humans, meaning it's not very contagious. (AP Photo/Columbus Dispatch, Kyle Robertson)

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