West Nile Virus Update for 2004

West Nile virus has continued its inexorable spread westward across the United States and its presence is now confirmed in all states except Alaska and Hawaii. As of October 27, the USDA reported a total of 1192 equine cases throughout the United States, of which 521 were in California and 109 in Arizona.

Information on the incidence of equine cases on a state-by-state basis can be

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