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 number of cases in Texas alone grew to over 760 before the state declared it officially over in August, while total cases nationwide have topped 1,800, with infections confirmed in at least 39 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 unvaccinated people who get measles will be hospitalized. About 1 out of every 1,000 children with measles will develop brain swelling that can lead to brain damage, and up to 3 of every 1,000 children who become infected will die, the CDC says.
The largest outbreak so far this year has been in West Texas, but cases have been reported in other states around the country, as well. In South Carolina, for example, dozens of students were quarantined in October due to an outbreak.
