Horses in one barn at Prairie Meadows in Iowa have been quarantined due to a possible case of equine herpesvirus.

The order to keep horses from entering or leaving the barn area came late in the afternoon of June 6 after Storm Wrangler showed symptoms of the respiratory virus, which resulted in the death of two horses at Churchill Downs this spring.

Storm Wrangler, an unraced 3-year-old, had muscle cramps June 3 and was listless the next day. He has been taken to the Iowa State University veterinary clinic for examination. Trainer Paul Pearson said Storm Wrangler had been vaccinated for the disease.

Barn D-4, which houses horses from Pearson and six other trainers, is quarantined from other horses but not humans. Those horses couldn’t train June 7 but they were walked in isolation from other horses. If the quarantine remains, Prairie Meadows would likely have to set up special training times for the horses, who won’t be able to race until the threat of the virus has passed