Hays County Development Services (HCDS) was notified of two positive samples of West Nile Virus (WNV) from mosquito traps in San Marcos on July 7.

Infected mosquitoes transmit the WNV through bites; 80% of infected people have no symptoms, while about 20% may develop fever, headache, body aches, rash, or other flu-like symptoms. Adults 50-years old or older and those with weakened immune systems, are at higher risk. There is currently no treatment for WNV and those experiencing symptoms should seek medical treatment. 

Mosquito traps are maintained as a part of the HCDS Mosquito Surveillance Program and HCDS conducts mosquito surveillance from May to November when Mosquitoes are most active, according to a press release sent on July 10.

“Hays County is committed to protecting the health and well-being of our residents, and we’re staying proactive in monitoring mosquito activity across the county,”  said Hays County Judge and Director of Emergency Management Ruben Becerra in the press release. “With traps testing positive for West Nile Virus, it’s important for all of us to take simple steps to stay safe.”

Hays County recommends residents follow the three D’s to protect against WNV: defend, dress and drain. Defend yourself by using EPA-approved repellents, dress yourself in long, loose and light colored clothing and when outside drain all standing water. 

Across Texas, there have been 462 positive samples for the WNV in 2026. However, there are no human cases of the WNV reported in Hays County.

“I want to thank our Health Department and Development Services teams for their continued efforts to keep our community informed and protected, and we appreciate our residents for doing their part as well,” Beccerra said in the press release. “Together, we can help reduce the risk and keep Hays County safe and healthy.”

For more information on the West Nile Virus, visit the CDC’s website.