An outbreak of Salmonella Typhimurium has spread to 42 states in the US, with almost 400 people infected by the bacteria and up to 20% of the victims requiring hospitalization.

The CDC, in conjunction with the USDA, the FDA and the Food Safety and Inspection Service (FSIS), is investigating the multi-state outbreak. The illnesses were said to have begun between September 3 and December 29, 2008, with most illnesses beginning after October 1.

Those infected with salmonella experience fever, diarrhea, and abdominal cramping about 12 to 72 hours after infection. The illness usually lasts anywhere from four to seven days. The list of states and possible foods involved have not yet been released.

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