In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected. | Photo: The Horse Staff

Three Clark County, Nevada, horses have been diagnosed with equine herpesvirus-1 (EHV-1), and others might have been exposed to the virus.

On March 15, Nevada State Veterinarian JJ Goicoechea, DVM, announced that he’d placed a facility in Clark County under quarantine after one horse residing there tested positive for EHV-1.

At the time, the Nevada Department of Agriculture (NDA) noted that horses at the Nevada State Junior/High School Rodeo, which took place Feb. 22-24 in Pahrump, might have been exposed and should be monitored for signs of disease, such as fever, cough, or runny nose