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.
As of May 6, 138 Mustangs have died of equine influenza at the Cañon City Wild Horse and Burro Facility.
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.
As of May 3, 119 Mustangs at the Cañon City Wild Horse and Burro Facility have died from an endemic strain of equine influenza.
Both horses are deceased, and the facility is under voluntary quarantine.
Three other equids at the farm are suspect cases but unconfirmed.
The gelding is recovering, and the facility is under official quarantine.
The undervaccinated gelding was euthanized due to the severity of the disease.
The horse, which reportedly was imported illegally, has been euthanized.
The mare was euthanized after developing the neurologic form of EHV, and the affected property is under quarantine.
One horse tested positive, and six have been exposed.
Test results were pending since April 7.
As of April 14, equine-herpesvirus-related quarantines have ended on nine premises.
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