measles outbreak in Texas, particularly affecting San Antonio and San Marcos, has raised significant public health concerns. Health officials have issued warnings following the identification of a person with measles who visited multiple locations within these cities between February 14 and 15, 2025 . This outbreak is notable not only for its rapid spread but also because it represents the most severe incidence of measles in Texas in nearly three decades, highlighting the urgent need for vaccination to mitigate further transmission .
San Antonio and San Marcos, according to the Texas Department of State Health Services.
Officials say an individual who tested positive for the virus in West Texas traveled to two major universities and one of the nation's busiest tourist attractions — the San Antonio River Walk.
Measles virus can remain infectious in the air for up to two hours after an infected person leaves an area. 
Illness onset (high fever, cough, runny nose, and red, watery eyes) begins a week or two after someone is exposed. A few days later, the telltale rash breaks out as flat, red spots on the face and then spreads down the neck and trunk to the rest of the body. 
Texas at San Antonio . Individuals who were present at these locations during specified times have been advised to monitor themselves for symptoms such as fever and rash for up to 21 days . The current outbreak is linked to low vaccination rates in Gaines County; therefore, health authorities are emphasizing the importance of maintaining immunization against preventable diseases like measles .
In light of these developments, local health departments are urging unvaccinated individuals to consult healthcare providers promptly if they exhibit any symptoms associated with measles. This proactive approach aims not only to safeguard individual health but also to curtail the wider spread of this highly contagious virus within communities . As this situation unfolds, it underscores a critical public health message: vaccination remains an essential tool in preventing outbreaks and protecting community health.
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