Already in 2025, the United States has reported more measles cases than in any full year since the early ‘90s, according to federal data. And that record-setting case count has been driven by a massive outbreak that began in Texas.

This year is the worst for measles spread in the U.S. since 1991. The news comes as Missouri has become the 18th state with an outbreak in 2025.

The United States is hit by a measles epidemic as the number of cases reaches an unprecedented high after almost 25 years of what was termed as the disappearance of measles. The US Centers for Disease Control and Prevention reported that 1,