A Coggins test screens horses’ blood for antibodies that are indicative of the presence of EIA. | Photo: Erica Larson/The Horse

The Colorado Department of Agriculture’s (CDA) State Veterinarian’s Office is continuing their investigation into a Weld County horse that tested positive for equine infectious anemia (EIA) in late August.

With the help of records from CDA’s Brands Division and Rocky Mountain Regional Animal Health Laboratory, the State Veterinarian’s Office has determined that approximately 240 horses were on the now-quarantined premises during the same time as the index animal.

More than 100 of those horses were sent to 20 other states across the country and steps are being taken to locate, quarantine, and retest those horses. At this time, no other horses have tested positive for EIA