First West Nile Positive Mosquito Sample Confirmed This Season


Edrea Au
Sr. Public Information Officer
Tarrant County Public Health

Tarrant County Seal

Tarrant County Public Health Confirms First West Nile Positive Mosquito 

April 26, 2023 - (Tarrant County) - Tarrant County Public Health (TCPH) has confirmed a West Nile Virus (WNV) positive mosquito sample, the first of the 2023 season. No human cases have been reported in 2023. The positive sample was collected in the City of Euless. West Nile Virus season typically runs from April through mid-November. Local cities and Tarrant County may perform mosquito treatment, as appropriate, in their jurisdictions.

So far, 369 mosquito samples have been tested at TCPH’s North Texas Regional Laboratory.

Last year, TCPH reported its first WNV positive mosquito sample on May 11.

TCPH reminds residents to take measures to safeguard against the WNV. Residents should dump standing water on their property, use repellent, and whenever possible, dress in long pants and long sleeves.


  • Mosquitoes need water to breed. They don’t lay their eggs in the air or on the ground, so dump ALL standing water.
  • Infected mosquitoes transmit WNV to people after feeding on infected birds.
  • Birds don’t transmit WNV to people. Mosquitos do.
  • Larvicides are products used to eliminate mosquitoes before they become adults.
    • Apply larvicides directly to water sources that hold mosquito larvae.

For more information about West Nile Virus visit the Be Mosquito Free webpage.

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News release date: April 26, 2023