EIA-Suspect Horse Identified In Colorado

Confirmatory tests are currently being run after a nonracing horse at Arapahoe Park tested positive for EIA.
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On June 23 the Colorado Department of Agriculture (CDA) State Veterinarian’s Office received notice from the USDA National Veterinary Services Laboratory (NVSL) that a nonracing horse presently located at Arapahoe Park in Aurora, Colorado, tested positive for equine infectious anemia (EIA).

Confirmatory tests are currently being run, and Arapahoe Park is currently under a hold order that restricts movement of horses until the CDA completes an initial investigation. The affected horse has been in Colorado less than 60 days and came from an out-of-state track. It appears that the horse was infected prior to coming to Colorado and previously tested negative for the disease in May 2015. Because the disease is most commonly spread by biting flies and it is very early in Colorado’s fly season, the risk of disease transmission to other horses at the track appears to be relatively low.

Personnel from the CDA and USDA Veterinary Services will be working with Arapahoe Park and the horse’s owner to gather more information to appropriately respond to the initial positive EIA test.

The CDA said EIA is a viral disease that affects equids which causes red blood cells to break down. Some infected horses might not show any apparent signs of disease, but EIA can cause high fever, weakness, weight loss, an enlarged spleen, anemia, a weak pulse, and death in some horses

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