Mosquito & Vector-Borne Reports
|Disease||Total Number of Cases||Number of Deaths|
|West Nile Virus||0||0|
|St. Louis Encephalitis Virus||1||0|
|Flavivirus (Unspecified) †||0||0|
Disease Statistic Notes
- * To date, Maricopa County has only experienced imported cases of Chikungunya, Dengue and Zika, meaning that residents brought the disease in from other places.
- † Flavivirus (Unspecified) indicates an infection that could not be attributed to a single mosquito-borne disease.
- All data are provisional / Based on date reported to Public Health.
West Nile Virus Reports
The Maricopa County Department of Public Health (MCDPH), Office of Epidemiology, and the Maricopa County Department of Environmental Services (MCESD), Office of Vector Control, collaborate to educate and protect the residents of Maricopa County against West Nile virus. The reports below provide detailed information about West Nile Virus (WNV) activity in Maricopa County.
For more information on mosquito-related diseases and prevention, go to our Mosquito Diseases page.
Weekly Seasonal Reports
The West Nile Virus Season is from April to November. Human Cases (reporting time period is from Sunday to Saturday, week ending (W/E) is always a Saturday)
View the Most Recent Weekly Seasonal Report (PDF) | View All the Weekly Seasonal Reports
End of Year Final Reports
The WNV end of year report provides information such as the annual number of WNV cases in Maricopa County, WNV activity by month, WNV rates per city, and number of mosquito pools by month.
View the Most Recent End of Year Final Report (PDF) | View All the End of Year Final Reports
Maricopa County Environmental Services Department (MCDES) Vector Control has an extensive mosquito trapping and testing program that enables staff to identify areas where there is a lot of mosquito activity and to detect mosquito-borne diseases. View the Mosquito-Borne Disease Statistics page for details.