CEM: 3 Pennsylvania Mares Exposed

Three mares in Pennsylvania are under quarantine after officials determined they had been exposed to contagious equine metritis (CEM).

"These mares are in varying stages of diagnosis in accordance with USDA-APHIS protocols and will remain under quarantine until confirmed negative," said Craig E. Shultz, DVM, director of Animal Health and Diagnostic Services with the Pennsylvania Department of Agriculture. "A fourth mare initially traced to Pennsylvania was located in Ohio and remains under quarantine there."


Watch a video interview on contagious equine metritis with Dr. Peter Timoney.
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These quarantines are part of an investigation that involves at least 350 horses in 28 states, according to the USDA. The investigation began in mid-December, when a Quarter Horse stallion on a Kentucky farm tested positive for the venereal disease during routine testing for international semen shipment. Ultimately, three more stallions in Kentucky and three in Indiana that had spent time on the original farm also tested positive.

About the Author

Erin Ryder

Erin Ryder is a former news editor of The Horse: Your Guide To Equine Health Care. She owns a portly gray gelding named Duncan and dabbles in several equestrian disciplines, with an emphasis on dressage.

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