61 potentially exposed horses have been quarantined in Riverside and Tulare counties.

The mare is recovering after exposure to a horse showing signs of EI on a trail ride.

Two horses have died, and one horse is receiving treatment.

State agriculture officials confirmed samples from the Monroe County broodmare were PCR-positive, and that other mares in the community also lost foals.

The Wisconsin Department of Agriculture reported the cases, which were detected and sampled in March.

Both horses are deceased, and the facility is under voluntary quarantine.