Equine Infectious Anemia
Utah officials confirm a Wasatch County horse was recently euthanized after testing positive for equine infectious anemia (EIA). It is the state’s first case of EIA in several years.
The owner imported the Quarter Horse from Mexico in the spring, according to the state’s agriculture group. Tests indicate the horse was negative for EIA, equine piroplasmosis (EP), Glanders, and Dourine before being brought into the states.
The 14-year-old horse was sold to California but never left Utah because of the positive EIA test. The diagnosis was confirmed with additional tests before the horse’s owner chose euthanasia.
The state quarantined another 10 horses at the ranch. Veterinarians are waiting for the horses’ EIA test results.
Shippers hauled 12 horses to Arizona from the same property in the spring. The state notified Arizona’s state veterinarian and its office is working to locate and retest those horses, although they tested negative prior to shipping.
Affected horses can carry the disease without symptoms for years or they may become acutely or chronically infected. Signs of the disease include fever, depression, anemia, and dependent edema. EIA attacks the horse’s immune system.
Biting insects transmit EIA including horse flies and deer flies. Sharing infected needles between horses can also lead to the virus.
Veterinarians recommend insect control, good sanitation, and testing new horses for EIA before bringing them onto your horse property.