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Mosquito & Vector-Borne Diseases
Even here in the dry climate of Maricopa County, mosquitoes are a problem. Mosquitoes are small insects that breed in standing water and the female mosquitoes need blood to lay eggs. Sometimes mosquitoes carry germs (e.g., viruses and parasites) that can be spread to a person when the mosquito bites them. Preventing mosquitoes from breeding and avoiding mosquito bites are the best ways to avoid getting these diseases.
To learn more about each mosquito-borne disease, find its name below.
To learn more about each mosquito-borne disease, find its name below.
Mosquito-Borne Diseases in Maricopa County 2021
Confirmed and Probable Cases & Deaths as of 06/10/2021
Locally Acquired
| Disease | Current Year Cases | Current Year Deaths | Cases Same Date Last Year | Deaths Same Date Last Year | 2020 Total Number of Cases |
|---|---|---|---|---|---|
| St. Louis Encephalitis (SLE) | 0 | 0 | 2 | 1 | 6 |
| West Nile Virus (WNV) | 0 | 0 | 3 | 1 | 3 |
| Unspecified Flavivirus (SLE/WNV)† | 0 | 0 | 0 | 0 | 2 |
Travel-Related*
| Disease | Current Year Cases | Current Year Deaths | Cases Same Date Last Year | Deaths Same Date Last Year | 2020 Total Number of Cases |
|---|---|---|---|---|---|
| Chikungunya | 0 | 0 | 1 | 0 | 1 |
| Dengue | 2 | 0 | 3 | 0 | 4 |
| Zika | 0 | 0 | 0 | 0 | 0 |
| Unspecified Flavivirus (Dengue/Zika)† | 0 | 0 | 0 | 0 | 0 |
All data are provisional, based on date reported to Public Health.
Current Year = 2021
Last Year = 2020
Disease Statistic Notes
* Travel-related cases are those in which 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 Opens a New Window. indicates an infection that could not be attributed to a single mosquito-borne disease.
Find annual summary numbers of mosquito-borne diseases in Maricopa County, including the number of human deaths attributed to them .
Additional mosquito-borne disease data may be found on the Arizona Department of Health Services’ Mosquito-Borne Disease webpage.
DISEASES
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Office of Epidemiology
Physical Address
4041 N Central Avenue
Phoenix, AZ 85012
Phone: 602-506-6900Fax: 602-372-8935