EIA Confirmed in Gallatin County, Montana, Horses

Multiple horses on a single farm tested positive. The premises is quarantined and additional testing is underway.
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The Montana Department of Livestock (MDOL) reported Oct. 26 that multiple horses on a Gallatin County premises have been diagnosed with equine infectious anemia (EIA).

The disease was last diagnosed in Montana in 2011 in Carbon County.

Also known as swamp fever, EIA is a potentially fatal viral disease of equines spread by biting insects. No vaccine or treatment is available for the disease, which is characterized by fever, depression, progressive weakness, weight loss, edema (fluid under the skin or in body cavities) and anemia. Not all horses show signs of illness, however, these animals serve as carriers capable of transmitting the disease.

The infected animals were discovered when they tested positive to a screening test required for equine movement into or out of the state. Otherwise known as a Coggins test, the preliminary results were confirmed by the USDA Animal and Plant Health Inspection Service National Veterinary Service Laboratories in Ames, Iowa

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