2012: A Severe Outbreak Year

There were 5,674 cases of West Nile virus disease in people, including 286 deaths in the U.S. 2012 had the most West Nile virus infections in the U.S. since 2003.

A color-coded map of the United States labeled 2012. A legend indicates that striped light blue marks states with avian, mammalian, or mosquito infections and includes no states. Dotted yellow marks states that had between 1 and 100 human disease cases which includes the majority of the states. Dotted orange is 101 to 500 cases. Cross-hatched red is 501 to 1000 cases and includes no states. Cross-hatched purple is over 1000 cases and only includes Texas. The only states with no recorded infections are Alaska and Hawaii.
West Nile virus infections recorded in 2012 in the U.S.