A mosquito pool in North Central San Antonio has tested positive for the West Nile virus, the city’s first such positive test for the 2025 season, Metropolitan Health District officials confirmed Monday.
The sample was collected near the intersection of West Avenue and Blanco Road, and Metro Health is scheduled to treat the area at 3 a.m. Wednesday, according to officials. Residents should remain inside during the time mosquito sprayers are working in the area.
The majority of those infected with the mosquito-borne West Nile virus don’t experience symptoms, but around 20% people who contract the ailment will develop fever, headache, body aches, joint pain, rash or swollen lymph nodes. The risk of symptoms is higher for those with weakened immune systems.
About one in 150 West Nile cases can be serious, or even fatal, according to the Centers for Disease Control. Last year, 56 Texans died from the virus, the Texas Department of State Health Services reports.
To prevent the proliferation of mosquitoes and lower the risk of diseases they carry, Metro Health officials recommend residents eliminate standing water from buckets, planters, trash cans and other containers to prevent the insects from laying eggs.
People should also use insect repellent with DEET or Picaridin on exposed area and wear long-sleeved shirts, long pants and socks during times when mosquitoes are active. If opening the windows of a home, make sure screens are in good repair to prevent the insects from flying inside.
More information is available at the City of San Antonio’s mosquito prevention website.
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This article appears in Jul 23 – Aug 6, 2025.
