Final 2009 West Nile Virus
Human Neuroinvasive Disease
Incidence in the United States
This map reflects surveillance findings occurring between January 1, 2009 through December 31, 2009 as reported to CDC's ArboNET system for public distribution by state and local health departments.
West Nile virus maps reflect surveillance reports released by state and local health departments to CDC's ArboNET system for public distribution. Map shows the distribution of human neuroinvasive disease (encephalitis and/or meningitis) incidence occurring during 2009 with number of human cases shaded according to incidences ranging from .01 to 9.99, 10 to 99.99, greater then 100 per million population, and WNV activity (human, mosquito, veterinary, avian and sentinel data).