According to the data, there were 343 cases of West Nile virus (WNV) in horses in the United States in 2023. WNV is a mosquito transmitted infection that exists in wild bird populations. It is transmitted to many animals including horses and humans and can cause severe long-lasting neurological complications. This statistic shows the number of West Nile virus (WNV) cases in horses from 1999 to 2023.
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U.S. Department of Agriculture, & CDC. (July 16, 2024). Number of West Nile virus cases among horses in the U.S. from 1999 to 2023 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 29, 2026, from /statistics/1024553/west-nile-virus-cases-in-us-horses/
U.S. Department of Agriculture, und CDC. "Number of West Nile virus cases among horses in the U.S. from 1999 to 2023." Chart. July 16, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 29, 2026. /statistics/1024553/west-nile-virus-cases-in-us-horses/
U.S. Department of Agriculture, CDC. (2024). Number of West Nile virus cases among horses in the U.S. from 1999 to 2023. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 29, 2026. /statistics/1024553/west-nile-virus-cases-in-us-horses/
U.S. Department of Agriculture, and CDC. "Number of West Nile Virus Cases among Horses in The U.S. from 1999 to 2023." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 16 Jul 2024, /statistics/1024553/west-nile-virus-cases-in-us-horses/
U.S. Department of Agriculture & CDC, Number of West Nile virus cases among horses in the U.S. from 1999 to 2023 ÌÇÐÄÆƽâ°æ, /statistics/1024553/west-nile-virus-cases-in-us-horses/ (last visited July 29, 2026)
Number of West Nile virus cases among horses in the U.S. from 1999 to 2023 [Graph], U.S. Department of Agriculture, & CDC, July 16, 2024. [Online]. Available: /statistics/1024553/west-nile-virus-cases-in-us-horses/
