Animal health officials today explained that the announcement about the equine herpesvirus type 1 (EHV-1) cases at Turfway Park in Florence, Ky., was not made sooner was because the virus wasn’t considered to be actively circulating in the environment until a third horse exhibited clinical signs and tested positive for the virus.

A gelding and a filly with neurologic signs were admitted to Rood and Riddle Equine Hospital in Lexington, Ky., on March 6. By March 11, positive results for EHV-1 had been received by the attending veterinarian, but quarantine protocol wasn’t established at Turfway until Monday, March 17, after a third horse developed clinical signs and tested positive for the virus. The public was notified for the first time on Tuesday, March 18

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