Mosquito-borne diseases include diseases caused by viruses (also called arboviruses) and parasites which are transmitted through the bite of an infected mosquito. The most commonly reported mosquito-borne illness in West Virginia is La Crosse encephalitis; however, travel-associated mosquito-borne diseases (such as dengue fever and malaria) are also reported in West Virginia residents each year. Mosquito-borne diseases are most common during the summer and fall months when mosquitoes are active. Prevention of mosquito-borne illness includes removing containers that collect water near homes (where mosquitoes lay eggs) and the regular use of mosquito repellants.

Mosquito-borne Disease Reporting

Mosquito complaints should be reported to your Local Health Department.

Mosquito-borne Disease Resources

Public Information and Brochures

Aedes triseriatus is the main vector for La Crosse encephalitis. It is a day-biting mosquito species. Females usually lay their eggs in pools of water in tree holes and also in man-made water holding containers, like discarded tires.

Mosquitoes can lay eggs even in small amounts of standing water. Discarded tires serve as perfect artificial breeding sites since water can accumulate inside of them.

West Nile virus has been identified in more than 200 species of birds, including the American Crow. Most of these birds were identified through public reporting of dead birds.

Surveillance Data