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West Nile Virus

Dallas County Health and Human Services - 2377 N. Stemmons Freeway, Dallas, TX 75207
Telephone: 214-819-2000

Fight the Bite with DCHHS Online Mosquito Services

FightTheBite DCHHS is committed to protecting the health and welfare of the communities we serve from mosquitoes and vector-borne disease. Residents experiencing a mosquito problem may call (214) 819-2115 or click here to set up a free service request.

Click here to check if mosquitoes have tested positive for West Nile in your zip code.

Mosquito Season

There are more than 40 mosquito species in Dallas County.  While mosquitoes can be active year round, generally, mosquito season is from May to November.  During the winter Culex quinquefasciatus overwinter as adults in sheltered areas while Aedes species overwinter as eggs in flood prone environments.  Seasonally, with warm temperatures and proper water conditions, these species developed or emerge from their winter habitats.  It is during the summer months when the risk of mosquito-borne disease transmission is greatest from July-August.

What is West Nile virus?

West Nile virus (WNV) is a disease that is spread by the bite of an infected mosquito. Mosquitoes become infected when they feed on the blood from infected birds.

The infected mosquitoes can then transmit WNV to humans and animals. West Nile disease can vary in severity. People over 50 years of age have the highest risk of severe disease.

Severe WNV infections can cause neurologic complications such as encephalitis. Milder symptoms include fever, headache and muscle aches.


  West Nile Watch

  Fact Sheets

  Frequently Asked Questions

  Educational and Prevention Materials