West Nile Virus Cases

Staying informed about where West Nile cases are occurring can help you and your family take extra precautions to prevent and reduce the risk of mosquito exposure. For more information on West Nile virus, visit our Mosquito-borne webpage.

Please keep the following in mind when reviewing these data:

  • Data will be updated every Friday through the end of mosquito season, which ends October 31st.
  • Data include only those investigations for which notifications have been submitted and approved by VDH Central Office staff as meeting CDC/CSTE case definition criteria of Probable or Confirmed.
  • A surveillance case definition is a set of uniform criteria used to define a disease for public health surveillance. Surveillance case definitions enable public health officials to classify and count cases consistently across reporting jurisdictions.
  • Cases are reported by local health district. Click here to view which health district you are located in.