Number of U.S. Horses Exposed to CEM Hits 920

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The ongoing investigation into contagious equine metritis (CEM) now includes more than 920 exposed or positive horses, according to the USDA.

The investigation began in mid-December 2008, when a Quarter Horse stallion on a Kentucky farm tested positive during routine screening for international semen shipment.

According to the USDA's Animal and Plant Health Inspection Service (APHIS),

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