As of Aug. 25, Florida led the United States in the number of documented equine cases of Eastern equine encephalitis (EEE), a mosquito-borne disease with mortality rates of around 90% in horses. Washington state officials had confirmed the most equine cases of West Nile virus (WNV) this year.
Thus far in 2009 cases of EEE are largely clustered in the Southeast. According to the USDA's
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