How common is Vibrio parahaemolyticus food poisoning?

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About 4,500 people become infected by the Vibrio parahaemolyticus bacteria species each year in the United States, but it is likely that many cases are not reported since many people recover without medical treatment. The illness is most often reported in the Atlantic, Gulf, and Pacific coastal states, since these states are near the salt waters where the organism exists. Cases reported from non-coastal states typically result from tainted seafood or travel in coastal states. In 2007, cases of infection caused by this organism became nationally reportable by state health departments to the Centers for Disease Control (CDC).