Is Japanese Encephalitis Next?

In 2002, West Nile Virus hit the upper mid-west horse population with a vengeance.  Our practice examined ten cases in 7 days; 50% died.  Those surviving battled an extremely difficult illness for 5-7 days with significant expenses to owners.  West Nile cases, afflicting both horses and humans, are still sporadically reported.  West Nile immunization is standard in our practice; thankfully we haven't seen a case since 2003.  


In addition to West Nile, Eastern Equine Encephalomyelitis, is another mosquito-borne encephalitis virus afflicting horses in the upper mid-west.  The American Association of Equine Practitioners lists these two viral diseases in its core vaccine recommendations: http://www.aaep.org/core_vaccinations.htm. Similar diseases, rarely occurring in the United States include Western Equine Encephalomyelitis and Venezuelan Equine Encephalomyelitis.  


Another encephalitis; Japanese Encephalitis, as pointed out by Drs. Peter Timoney and Stacy Oke, may be the next mosquito borne viral disease afflicting North American Horses; http://www.thehorse.com/ViewArticle.aspx?ID=20319.


Our best recommendation to horse owners?  As we approach the upper mid-west's mosquito-borne disease season height (late summer to early fall) make sure your horse's immunizations are up to date!