As 2026 begins, public health officials in Texas are urging vigilance. From mosquito-borne viruses to contagious flu strains and ongoing measles concerns, the Lone Star State is seeing a mix of infectious disease threats that highlight the importance of prevention, vaccination, and community awareness.
West Nile Virus Detected in Harris County
For the first time in 2026, West Nile virus has been confirmed in mosquito populations in two Harris County ZIP codes. While no human infections have been reported yet, the detection signals the start of a critical mosquito season.
Public health teams are taking proactive measures, including spraying targeted areas and reminding residents to reduce standing water where mosquitoes breed. Simple actions like emptying flowerpots, cleaning gutters, and covering water storage tanks can significantly reduce risk.
“It’s a reminder that mosquito-borne diseases are not just summer concerns,” said a Harris County health official.
Severe Influenza Strain Surging Across Texas
Texas is also grappling with a rapidly spreading influenza A (H3N2) subvariant, particularly in San Antonio and surrounding areas. This strain is more contagious than typical seasonal flu, and experts warn that symptoms can be severe, especially in older adults and those with chronic conditions.
Vaccination remains the most effective defense, along with hand hygiene, mask use in crowded spaces, and staying home when sick. Health authorities caution that this flu season could extend into March or beyond, so Texans should remain alert.
Measles Vaccination Concerns Persist
Measles continues to be a challenge in Texas. Despite being a vaccine-preventable disease, parts of Southeast Texas report vaccination rates below the 95% threshold needed for herd immunity. This gap leaves communities vulnerable to outbreaks, especially in schools and daycare centers.
Public health campaigns are encouraging parents to ensure their children are up-to-date on the MMR (measles, mumps, rubella) vaccine, while healthcare providers are increasing outreach to underserved populations.
Wastewater Surveillance: Early Warning in Laredo
Innovative monitoring methods, such as wastewater surveillance, are helping officials detect diseases before cases appear. Recently, measles genetic material was found in Laredo’s wastewater, indicating early circulation of the virus.
This proactive approach allows public health teams to respond quickly, deploy vaccination clinics, and educate residents about early symptoms—an essential step in preventing larger outbreaks.
Staying Safe in Texas
In light of these alerts, Texans are encouraged to:
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Reduce mosquito breeding sites around homes.
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Get vaccinated for flu and ensure MMR coverage is current.
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Practice good hygiene and avoid contact with sick individuals.
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Stay informed through local health department updates.
Public health threats like West Nile, influenza, and measles remind us that prevention is the best medicine. By taking simple steps and staying aware, residents can protect themselves and their communities this season.