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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 (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 50 years of age and older 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.

Frequently Asked Questions (FAQs) about WNV

  • Is it contagious?
    No. WNV 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 FAQs about WNV
    click here for English | click here for Spanish

Reports and Profiles

2014 WNV Weekly Surveillance Report: Week 38 ending September 20, 2014

2013 Human WNV Epidemiologic Profile, Dallas County

2005 - 2012 Dallas County WNV Cases

Download WNV educational and prevention materials:

Each file contains English & Spanish versions

DCHHS WNV fact sheet
DCHHS WNV poster

DCHHS Fight the Bites flyers general public | children

DCHHS WNV brochure in English

DCHHS WNV brochure in Spanish

To download the Texas Department of State Health Services fact sheet on WNV click here.


To report mosquito activity, request service and search past treatments: click here.

West Nile Watch

West Nile Watch contains up-to-date information on prevention tips, positive mosquito traps and human cases. Click here for current issue

Take a virtual tour of a home with potential mosquito breeding sites at http://mosquitosafari.tamu.edu/.

For more information visit http://www.cdc.gov/ncidod/dvbid/westnile/index.htm or

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

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

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2377 North Stemmons Freeway, Dallas, Texas 75207-2710 | 214-819-2000