In 2025, the United States has recorded the most measles cases in more than 30 years, Centers for Disease Control and Prevention data shows. A large share of the infections were connected to an outbreak in West Texas that led to the deaths of two children .

The total number of cases nationwide has topped 1,900, with infections confirmed in at least 42 states.

Measles is one of the most contagious infectious diseases, and in some cases, can cause severe infections in the lungs and brain that can lead to cognitive issues, deafness or death. But doctors and health officials say the vaccine , which is normally given as part of the combination measles-mumps-rubella (MMR) vaccine, is highly safe and effective .

While most people's symptoms improve, about 1 in 5 un

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