10 States Where Rare and Exotic Diseases Lurk

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California

Every few years, whooping cough (or pertussis) resurfaces in the U.S. In 2010, California reported 9,477 cases of this highly contagious, potentially deadly bacterial infection, the largest outbreak since the 1940s. (Health officials say a falloff in vaccines, including the Tdap booster shot for teens and adults, is to blame.)

As if that weren't enough, California also has a disproportionately high number of cases of typhoid fever, an infection spread through contaminated food and water that causes stomach pain, weakness, and a sky-high fever. In 2009, California accounted for 90 of the 400-odd cases in the U.S.

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