Facebook logo   Twitter Logo
Lab Services
Disease Reporting
Energy Assistance
Home Loan Counseling

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 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.

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

WNV 2015 Latest Surveillance Report - Week 42 ending October 24, 2015

WNV DCHHS Health Advisory 5/21/15

DCHHS "Mosquito Season" Commissioners Court Presentation 3-31-2015

WNV 2013 Human Profile

WNV 2013 Guide for Epidemiologic Analysis of Mosquito Trap Data in Dallas County

WNV 2012 Human Profile

WNV Cases in Dallas County from 2005-2012

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


DCHHS WNV Fact Sheet in Various Languages



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

More Information

DCHHS PSA: West Nile and Zika Viruses

Texas Department of State Health Services information on WNV

CDC information on WNV

Texas A&M AgriLife Extension Mosquitoes and Disease Newsletter

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

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


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


About Us | Press Releases | Public Health Preparedness | Environmental Health | Client Services | Clinical Services

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