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 2021
Case numbers are updated every Friday around 9 a.m.
Confirmed and Probable Cases & Deaths as of 10/21/2021
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 = 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.