Lab Services

West Nile Virus

Fight The Bite with DCHHS Online Mosquito Services

FightTheBiteDCHHS 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.



What is West Nile virus?

West Nile virus 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 West Nile virus to humans and animals. West Nile disease can vary in severity. People 50 years of age and older have the highest risk of severe disease.

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


  • Is it contagious?
    No. West Nile virus is not spread through contact from person to person or from animal to person.
  • How is it diagnosed?
    Diagnosis of WNV requires a special blood test. Anyone who experiences symptoms of severe WNV illness should see a physician as soon as possible.
  • What is the treatment?
    There is no specific treatment for WNV infection. Patients receive supportive medical care and rehabilitation if needed.
  • What if I’m not experiencing any symptoms?
    Most infected people will show no symptoms. Symptoms typically develop between 3 to 14 days after a mosquito bite.
  • For other Frequently Asked Questions about West Nile virus
    click here for English | click here for Spanish

To report mosquito activity click here

West Nile virus Profile: 2013 Human WNV Epidemiologic Profile, Dallas County

Download DCHHS’ West Nile prevention materials by clicking the links below:


(Each file contains both English & Spanish versions)

DCHHS West Nile fact sheet
DCHHS West Nile poster
DCHHS Fight the Bites flyers general public | children

Texas Department of State Health Services fact sheet (no Spanish version)

Learn More About West Nile Virus

West Nile Virus Cases, 2005-2012


Read West Nile Watch – a digital publication that is produced during the season which contains up-to-date information on infected mosquito pools, control efforts and prevention tips.
Click here for current issue

Take a virtual tour of a home with potential mosquito breeding sites at

Visit or for more information.

For general questions or for more information about Dallas County Health and Human Services,
please email Director Zachary Thompson at


Zachary S. Thompson
Christopher Perkins, D.O., M.P.H.
Medical Director / Health Authority


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