The Michigan Department of Agriculture and Rural Development (MDARD) reported April 7 that a fourth horse in that state has tested positive for equine herpesvirus-1 (EHV-1). The Saginaw County horse is the second to be found positive on a single quarantined farm.

On March 21, veterinarians euthanized an 8-year-old Quarter Horse gelding from Livingston County that tested positive for EHV-1 after attending a barrel racing event in Barry County in early March. A second horse from Livingston County and another from Saginaw County subsequently tested positive for the virus.

The two Saginaw County horses and the remaining Livingston County horse are under veterinary care.

"The MDARD continues to follow up on all horses potentially exposed to the first Michigan EHV-1 positive horse reported on March 19," the department said in a statement. "At this time, we consider all horses that attended a March 7 event in Barry County to be at the highest risk of exposure

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