West Nile virus (WNV) activity reported to ArboNET, by county, United States, 2012
*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 activityć (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.