Information for Health Departments and Districts
Dead bird and mosquito testing are no longer provided free of charge, although a few counties are still doing some limited testing either through Environmental Health or through mosquito control.
CDC ArboNET - National and State level maps from 2003 to present.
Surveillance for mosquitoes provides information on species type and population. Positive mosquitoes indicate risk of West Nile virus is increasing, but even increases in Culex species populations can indicate a higher risk of disease locally.
Dead Bird Surveillance
Dead bird surveillance provides general information about when and where West Nile Virus is present in an area. Monitoring and mapping dead bird calls provides a means of determining where virus transmission may be occurring and presents an opportunity to educate callers about reducing their risk for arboviral diseases.