West Nile Fever in the USA (current summary)

So far in 2012, all 48 states in the continental USA have reported West Nile virus infections in people, birds, or mosquitoes. A total of 5,054 cases of West Nile virus disease has been reported with slightly more than half the cases classified as affecting the central nervous system. There have been 228 reported deaths. This total is the highest number of West Nile virus disease cases reported to the US Centers for Disease Control and Prevention through the first week in November since 2003. Almost 80 percent of the cases have been reported from 12 states (Texas, California, Louisiana, Mississippi, Illinois, South Dakota, Michigan, Oklahoma, Nebraska, Colorado, Ohio, and Arizona). More than one third of all cases was reported from one state, Texas.

Although cooler weather will reduce mosquito activity, travellers to areas where the West Nile Fever virus continues to be active can reduce their risk of exposure to this virus by taking all necessary precautions to avoid mosquito bites.

Visit our Health Library for more information on exposure to and the prevention of West Nile Fever.

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