*As reported by state health departments in a survey conducted in October 2010. Surveillance for human disease and presumptive viremic blood donors is performed in all counties. †Includes WNV veterinary disease cases and WNV infections in mosquitoes, birds, and sentinel animals.

Map shows the distribution of counties that are conducting non-human surveillance* but have not reported West Nile virus activity for 2012 (shaded grey). Map also shows the distribution of non-human activity† (shaded in light green) and human infections including presumptive viremic blood donors (shaded dark green) occurring during 2012 by county. If West Nile virus infection is reported from any area of a county, that entire county is shaded.

Please select the state from the drop down list below, to view any WNV activity by state, and county, of Bird, Human, Mosquito, Sentinel, or Veterinary data provided by ArboNET.

Select State Alabama Alaska Arizona Arkansas California Colorado Conneticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachussets Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode island South Carolina South Dakota Tennesee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming (Data provided by ArboNET presented by USGS)

For information on WNV activity in Canada please see:
http://www.phac-aspc.gc.ca/wnv-vwn/index.html