The Lois Bates Acheson Veterinary Teaching Hospital at Oregon State University (OSU) has resumed normal operations following an outbreak of equine influenza, which for the past two weeks kept it from accepting horses for anything but emergency services.

There were six confirmed cases of equine influenza, a highly contagious respiratory disease in horses that usually isn’t fatal, but is a particular concern to foals and pregnant horses, since it can cause abortion. The original source of the infection appears to be a horse admitted to the hospital. Four horses are still shedding the virus but are now contained in an isolation facility, and all are expected to make a full recovery.

All horses in the Large Animal Hospital are testing negative for the virus, and stalls have been disinfected, then left empty for at least 48 hours, an adequate time to kill any remaining flu virus in a dry environment.

Hospital officials say they plan to investigate the impact the outbreak has had on hospital operations and the local equine community