The University of Texas and Austin Public Health created a measles simulator for school districts and private schools around the county to better understand their risks.

The U.S. is having its worst year for measles spread in more than three decades, and the year is only half over.

Measles cases in the US have reached their highest level since 1992, driven largely by an ongoing outbreak in west Texas.

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.

Gaines County, where Texas' massive measles outbreak began in January, no longer has ongoing measles transmission, according to state health officials.

Additional cases linked to the Texas outbreak have been identified in New Mexico and Oklahoma. Related: Texas measles outbreak could last 12 months, experts say, risking U.S. elimination status ...

The Centers for Disease Control and Prevention says the U.S. is currently experiencing its worst measles outbreak in more than 30 years, according to the Associated Press. On Wednesday, the CDC said the 2025 case count has surpassed the 2019 count, when there were 1,274 cases for the year.

Measles cases in the U.S. have hit a three-decade high, reaching the highest yearly total since 1992 in less than seven months, according to data released Wednesday by the Centers for Disease Control and Prevention.