As of March 11, the United States Department of Agriculture has confirmed 52 cases of contagious equine metritis (CEM) in Orange County, Florida. The initial case was a mare bred by live cover to a pony stallion, who also tested positive. Most positive cases in this outbreak are geldings at the stallions facility who were infected via sheath cleaning.In addition to the 52 confirmed cases, another 145 horses are potentially exposed.EDCC Health Watch is an Equine Network marketing program that utilizes information from the Equine Disease Communication Center (EDCC) to create and disseminate verified equine disease reports. TheEDCCis an independent nonprofit organization that is supported by industry donations in order to provide open access to infectious disease information.About Contagious Equine MetritisContagious equine metritis (CEM) is a venereal disease of horses caused by the bacteriaTaylorella equigenitalis. It can impact fertility in both mares and stallions. The United States is considered to be CEM-free. Therefore, CEM is a foreign animal disease that is reportable at both the federal and state level. The U.S. horse industry could suffer significant economic losses if the disease became established here.CEM is spread during breeding or through contact with contaminated objects.It is highly contagious among horses and can be difficult to detect and control. Signs of illness in infected mares may not be obvious, and stallions carry the bacteria without showing any signs at all. In some cases, mares may also become carriers. Foals born to infected/carrier mares can also become long-term carriers of the bacteria.