Important viral (equine arteritis, equine influenza, equine infectious anemia, equine herpes including the abortion, paralytic and respiratory forms) and bacterial (such as the causative agent of strangles) microorganisms are being investigated by the Infectious Diseases group. In addition to laboratory-based studies, the incidence of infectious diseases in horses throughout the country is closely monitored, and studies are conducted to assist horse owners and veterinarians in managing severe outbreaks including those caused by bioterrorism.