Equine West Nile Virus

During the summer of 2023, Colorado has seen an increase in horses affected by the West Nile Virus.

The Colorado Department of Agriculture's State Veterinarian's Office tracks the cases of equine WNV. To learn more about WNV in people, please visit the Colorado Department of Public Health and Environment

The first case of equine WNV in 2023 was confirmed on July 28 by the Colorado State Veterinarian. 

Vaccines have proven to be a safe and effective prevention tool for WNV in horses.

Horses vaccinated for WNV in past years will need an annual booster. If a horse has not been vaccinated in previous years, it will need the two-shot vaccination series. Visit the AAEP website for a comprehensive list of vaccination recommendations.  

Colorado response to Equine West Nile Virus