Churchill Downs is taking precautionary measures at its Trackside training facility in Louisville, Ky., after a Thoroughbred racehorse was diagnosed with strangles, a contagious bacterial disease.

Rumors began circulating the weekend of March 12, but John Asher, vice president of communications for Churchill Downs, said the disease was confirmed in only one horse on the property. The results of other tests are pending, he said.

“It’s nothing I would call an outbreak,” Asher said. “All that we’re doing is strictly precautionary.”

Asher said 43 horses housed at the end of two barns–the barns have a firewall down the middle–are being tested, as are ponies that are kept in the barns. Churchill, he said, has been in regular contact with the state veterinarian’s office