Encephalitis Virus, Western Equine

**Definition:** A species of ALPHAVIRUS that is the etiologic agent of encephalomyelitis in humans and equines in the United States, southern Canada, and parts of South America.

**Tree numbers:** - B04.820.230.440 - B04.820.578.875.054.360

**Synonyms:** - Encephalitis Viruses, Western Equine - Virus, Western Equine Encephalitis - Viruses, Western Equine Encephalitis - Western equine encephalitis virus - Western Equine Encephalitis Viruses - Encephalomyelitis Virus, Western Equine - WEE Virus