Measles cases have reached a 33-year high in the United States, and experts say declining vaccination rates are directly to blame.

With nearly six months left in the year, the total number of cases so far in 2025 has surpassed every year since 1992

Researchers blamed “long-standing gaps in measles vaccine coverage” for the case surge while noting that nearly all of this ... is achieved only when the vaccination rate is above 95%, according to the CDC. Approximately 88% of all confirmed cases ...

Measles cases in the United States have reached a record high since the infection was eliminated in 2000. Data published by the Johns Hopkins University Center for Outbreak Response Innovation (CORI) state that 1,285 measles cases have been reported in the U.S. in 2025.