According to the US Centers for Disease Control and Prevention, two doses of the MMR (measles, mumps and rubella) vaccine are 97% effective at preventing measles, while one dose is 93% effective. It is uncommon for someone who is fully vaccinated to develop measles, although the first breakthrough case of 2025 was recently detected in Colorado.

More people have contracted measles in the US so far this year than in any year in the last three decades. New data from Atlanta-based Centers for Disease Control and Prevention shows 1,288 infections this year through 38 states, including Georgia. By comparison, the US recorded 285 measles infections during all of 2024.

In 2025, the US reported 1,288 measles cases, the highest number in 33 years, primarily in Texas and neighboring states. Most infections occurred among unvaccinated individuals and vaccine-hesitant communities.

There are 1,288 confirmed measles cases across the U.S., the Centers for Disease Control and Prevention (CDC) said, warning that numbers are the highest they've been since 1992. Dr. Celine Gounder joins "CBS News 24/7" with more details.

ABC News' Dr. Tara Narula shares the latest CDC data showing the U.S. is experiencing the most measles cases nationwide since 1992.

There have been 1,227 confirmed measles cases this year, the Centers for Disease Control and Prevention said Wednesday.

Measles was considered eradicated in the U.S. in 2000. For the first time in 25 years, cases have reached a new high.

The U.S. has now recorded more confirmed measles cases this year than in any year in well over a quarter-century.

Measles cases in the US have reached a 33-year high, with nearly 1,300 cases reported in the last seven months, according to the latest data from the Centers for Disease Control and Prevention. At least 1,