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Western Equine Encephalitis is a rare mosquito-borne illness in the United States that can affect people and horses. Most people become infected through the bite of an infected mosquito. Most people will have either no symptoms or mild flu-like symptoms. Some people will develop more severe illness and may develop a fever, headache, vomiting, weakness. This virus occurs commonly in states and Canadian provinces that are west of the Mississippi river.


For information on how to report a disease click here. For any questions, please contact the appropriate health authority by phone or review the website for additional information.

Carson City, Douglas and Lyon Counties
Carson City Health & Human Services (CCHHS)
(775) 887-2190

Clark County
Southern Nevada Health District (SNHD)
(702) 759-1300

Washoe County
Washoe County Health District (WCHD)
(775) 328-2447

All Other Counties
Nevada Division of Public and Behavioral Health (DPBH)
(775) 400-0333