West Nile Virus Activity in the United States
Data Updated Automatically
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Currently, West Nile virus maps are updated regularly to reflect surveillance reports released by state and local health departments to CDC's ArboNET system for public distribution. Map shows the distribution of avian, animal, or mosquito infection occurring, with number of human cases if any, by state. If West Nile virus infection is reported to CDC from any area of a state, that entire state is shaded.