Vector-borne Disease Surveillance Reports

The Department conducts routine testing of mosquito pools and other sources of vector-borne illness. The results are published weekly during the annual peak period for vector-borne illnesses.


West Nile Virus

Report within 24 hours of Diagnosis to the Local Health Department.

West Nile virus is an infection that is spread by the bite of an infected mosquito. Identified in the United States in 1999, West Nile virus is seen most often during the summer and early fall months. Anyone can get infected with West Nile virus. People over age 50 and people with weak immune systems are at greater risk of developing severe illness. Mild symptoms are flu-like and may include fever, headache, body aches and sometimes a rash. Severe symptoms can include high fever, stiff neck and swelling of the brain. There is no specific treatment for West Nile virus. The best way to prevent the disease is to avoid mosquito bites.


Return to the main vector-borne illness page


Education Materials


Laboratory Testing and Guidance

Clinicians requesting West Nile virus testing should complete the Arboviral Testing Request worksheet and send via encrypted e-mail to


Sick/Dead Bird Reports

Routine bird testing for WNV has been discontinued, but if you find an ill or dead bird on your property, you should report it to your local health department and county mosquito control agency.


Local Health Departments Only:

Local health departments that receive reports of ill or dead birds should submit the Sick/Dead Bird Report form.

Last Reviewed: 11/14/2022