Tracking Outbreaks

Stay informed during the summer months to understand the risk level in your county:

• ArboNET: The CDC’s interactive map displays reported cases across the country.
• Local Monitoring: Check the local news, published reports, or the health department for information on virus activity, e.g., testing of WNV in birds and mosquitoes. Be alert when excessive dead birds are seen, and cases of horse WNV disease are reported.

Sample outbreak map of Kentucky via CDC.gov

Scan QR code or visit CDC.gov during the summer months to track current case numbers by location.

Sources

Castillo-Olivares, J., & Wood, J. (2004). West Nile virus infection of horses. Veterinary research, 35(4), 467-483.

Centers for Disease Control and Prevention. (n.d.). ArboNET Surveillance System. https://www.cdc.gov/mosquitoes/php/arbonet/index.html.

Figueiredo, L. T. M. (2007). Emergent arboviruses in Brazil. Revista da Sociedade Brasileira de Medicina Tropical, 40(2), 224-229.

Gould, C. V., Staples, J. E., Guagliardo, S. A. J., Martin, S. W., Lyons, S., Hills, S. L., Petersen, L. R. (2025). West Nile virus: a review. JAMA.

Ng, T., Hathaway, D., Jennings, N., Champ, D., Chiang, Y. W., & Chu, H. J. (2003). Equine vaccine for West Nile virus. Developments in biologicals, 114, 221-227.

Ronca, S. E., Ruff, J. C., & Murray, K. O. (2021). A 20-year historical review of West Nile virus since its initial emergence in North America: Has West Nile virus become a neglected tropical disease?. PLoS neglected tropical diseases, 15(5), e0009190.

For more information, contact:

Ainsley Yuknis Research Assistant Ainsley.Yuknis@kysu.edu

Katherine Kamminga

Katherine Kamminga Assistant Professor of Entomology Katherine.Kamminga@kysu.edu

Acknowledgments

Thank you to Professor Alexander Lai, Jennifer Rydzewski, and the DuPage County Forest Preserve for serving as reviewers for this info sheet.

Kentucky State University is an equal opportunity provider.

KYSU-CEP-INFO-ANR-2026-004