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As the U.S. marks a year of measles outbreaks, is the disease back for good?

By Scientific American  
   January 20, 2026

It has been a full year since one of the worst measles outbreaks in recent U.S. history began ripping through West Texas. The highly infectious disease has continued to burn across multiple U.S. states, Mexico and Canada since Texas reported an outbreak in children in January 2025. The U.S. had been virtually free of the disease for more than a quarter-century thanks to highly effective and safe vaccines, but now experts say we're on track to losing that status if officials determine measles has spread continuously for a year.

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