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.
Mosquito-Borne Diseases in Maricopa County 2022
Case numbers are updated every Friday around 9 a.m.
Confirmed and Probable Cases & Deaths as of 05/12/2022
*The number of WNV cases currently under review and pending classification is 5. This number is not reflected in the number of current cases above. ‡ Seven cases were reported in 2022 but occurred or had incubation periods in 2021
All data are provisional, based on date reported to Public Health. Maricopa County weekly counts may vary slightly from state reporting due to differences in data reporting.
Current Year = 2022 Last Year = 2021
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.