The Brief Another mosquito trap has tested positive for West Nile virus in Hays County The trap was collected on July 28 in San Marcos This is the fourth trap to test positive in Hays County this yearA fourth mosquito trap has tested positive for West Nile virus in Hays County. The backstory:The mosquito trap sample was collected from a site in San Marcos on July 28. This is the fourth West Nile virus-positive mosquito pool reported in Hays County in 2026. "We are continuing to actively monitor locations across the county and respond promptly by notifying the citizens of Hays County." "The detection of another mosquito trap testing positive for West Nile virus underscores the importance of continued vigilance.