SAN MARCOS, Texas - A third mosquito trap has tested positive for West Nile virus in Hays County.
What they're saying:
The mosquito trap sample was collected from a site in San Marcos on July 17.
This is the third West Nile virus-positive mosquito pool reported in Hays County in 2026.
At this time, no human cases have been reported in the county.
"Approximately two weeks ago, HCDS collected two samples that tested positive in San Marcos. We received confirmation from DSHS that the positive sample originated from the same location," said Nick VandenBroek, Environmental Health Specialist II. "We are continuing to monitor locations and respond promptly for community awareness."
What is West Nile virus?
Dig deeper:
While mosquitoes are present year-round, they are most active from May through November.
Infected mosquitoes can transmit West Nile through bites.
Symptoms
Symptoms of the infection can include fever, headaches, body aches, joint pain, vomiting, diarrhea, a skin rash on the torso of the body, and swollen lymph nodes.
About 80% of infected people usually show no symptoms.
While the risk is low for severe symptoms, people over the age of 50 and those with compromised immune systems can be at an increased risk for stiffness, disorientation, coma, tremors, vision loss, paralysis and, in extremely rare cases, death.
Patients can expect to have symptoms for three to six days, but may experience fatigue and weakness for weeks or even months.
There is currently no treatment for West Nile virus.
Preventing mosquito breeding
Everyone is encouraged to protect themselves from mosquito bites and prevent mosquito breeding.
Mosquitoes can breed in as little as one teaspoon of standing water. By draining all sources of standing water in and around your property, you reduce the number of places mosquitoes can lay their eggs and breed.
Remember the 3 Ds:
- Defend: Whenever outside, use EPA-approved insect repellents, and always follow label instructions.
- Dress: Wear long, loose and light-colored clothing outside.
- Drain: Drain or treat all standing water in and around your home or workplace where mosquitoes could lay eggs.
The Source: Information from the Hays County Development Services (HCDS)