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The measles, mumps, rubella (MMR) vaccine—which is up to 93 percent effective—has come under scrutiny within Donald Trump’s government, despite the rapidly rising number of cases nationwide.
Measles is not only extremely contagious but can also be dangerous. Data shows that 11 percent of people who contracted the illness required hospitalization, with more than half of those hospitalized being under the age of 19.
The CDC reports that 93 percent of individuals diagnosed with measles in 2025 were either unvaccinated or had an unknown vaccination status.
The remaining seven percent had received at least one dose of the MMR vaccine—three percent had received one dose, while four percent had completed the full two-dose series.