Most American owners are aware of the increased number of West Nile virus (WNV) cases confirmed in the U.S. horse population this year. What they might not know is how the virus affects horses in other countries.

Australia and New Zealand

According to C.J. (Kate) Savage, BVSc (Hons), MS, PhD, Dipl. ACVIM, WEVA Oceanic delegate, a similar virus–Kunjin–is endemic in parts of Australia.

"(Kunjin) is antigenically and genetically similar to WNV and was reclassified as a subtype of WNV in 1999 (WNV/Kunjin)," she said

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