Iowa Department of Agriculture (IDA) officials confirmed three Polk County horses with equine infectious anemia (EIA) on Feb. 24, with 25 horses exposed and under official quarantine. The positive horses, identified as Quarter Horses with unreported vaccination status and clinical signs, are currently affected and alive. Exposed horses on the premises are being tested.

Equine infectious anemia is a viral disease that attacks horses’ immune systems. The virus is transmitted through the exchange of body fluids from an infected to an uninfected animal, often by blood-feeding insects such as horseflies. It can also be transmitted through the use of blood-contaminated instruments or needles.

A Coggins test screens horses’ blood for antibodies that are indicative of the presence of the EIA virus. Most U.S. states require horses to have proof of a negative Coggins test to travel across state lines.

Once an animal is infected with EIA, it is infected for life and can be a reservoir for the spread of disease. Not all horses show signs of disease, but those that do can