Crunching the Numbers: California's Equine WNV Mortality Rate

California horse owners have been keenly aware of the problem presented by West Nile virus (WNV) in 2004, but the problem took a deadly turn last year. The virus was discovered in all but one of the Golden State's 58 counties, leaving only Del Norte County without any reported cases.

According to the California Department of Health Services, 42.2% of reported equine WNV cases in 2004

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