Equine Influenza Virus (EIV) is often cited as the most commonly diagnosed and economically important causes of viral respiratory disease in horses.  Therefore, the AAEP states that “all horses should be vaccinated against EIV unless they live in a closed and isolated facility.”  Like many other respiratory viruses, it produces fever, nasal discharge, and coughing.  So what sets this virus apart from other equine respiratory viruses?

Eastern Equine Encephalitis (EEE) and Western Equine Encephalitis (WEE) are both neurological diseases spread to horses and humans from infected wild birds and rodents via blood sucking mosquitos. The disease typically culminates in a profound depression that characterizes these diseases in the late stages, and gives them the common name of “sleeping sickness.” The American Association of Equine Practitioners considers vaccines against EEE and WEE to be "core" vaccines, recommended for all adult horses.