Vector-Borne & Zoonotic Reports

  1. Mosquito-Related
  2. Rabies
  3. 5-Year Combined

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 mosquito-borne illness.

Mosquito-Borne Diseases in Maricopa County 2020

Confirmed and Probable Cases & Deaths as of 10/08/2020

Locally Acquired

DiseaseCurrent Year CasesCurrent Year DeathsCases Same Date Last YearDeaths Same Date Last Year2019 Total Number of Cases
St. Louis Encephalitis (SLE)52808
West Nile Virus (WNV)3115417155
Unspecified Flavivirus (SLE/WNV)20


DiseaseCurrent Year CasesCurrent Year DeathsCases Same Date Last YearDeaths Same Date Last Year2019 Total Number of Cases
Unspecified Flavivirus (Dengue/Zika)00

All data are provisional, based on date reported to Public Health.

Disease Statistic Notes 

* To date, Maricopa County has only experienced travel-related cases of chikungunya, dengue and Zika, meaning that residents brought the disease in from other places or passed on the disease during birth as the result of infection acquired during travel.
† Unspecified Flavivirus indicates an infection that could not be attributed to a single mosquito-borne disease.

West Nile Virus End of Year 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.

Other Mosquito-Related Diseases
Other county reports for mosquito-borne illness are generated on an as needed basis.  

Mosquito-Borne Disease End of Year Reports
The end of year report provides information related to all local and travel-acquired mosquito-borne illness cases in Maricopa County. Data includes types/frequency of symptoms, locations of disease transmission, and characteristics of human infections. 
End of Year Final Report (PDF) 

Mosquito Sampling Statistics
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.

 For more data not found here, you also can visit the ADHS Mosquito-Borne Illness page

  1. Office of Epidemiology

    Physical Address
    4041 N Central Avenue
    Phoenix, AZ 85012

    Phone: 602-506-6900
    Fax: 602-372-8935
    Emergency: 602-506-6767