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.
Mosquito

DISEASES


Mosquito-Borne Diseases in Maricopa County 2017

Confirmed and Probable Cases as of 07/20/2017
Disease
2017 Number of
Cases to Date
2016 Number of
Cases to Date
LOCAL    
   St. Louis Encephalitis (SLE)
1
0
   West Nile Virus (WNV)
19
21
   Unspecified Flavivirus (SLE/WNV)†
0
0
TRAVEL-RELATED*


   Chikungunya
0
3
   Dengue
0
6
   Zika
1
11
   Unspecified Flavivirus (Dengue/Zika)†
1
2

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.
† Unspecified Flavivirus 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.

Click here for seasonal and annual summary reports on West Nile virus and other vector-borne diseases.

Additional mosquito-borne disease data  may be found on the ADHS Mosquito-Borne Disease webpage.