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Meanwhile, 92.5% of 2024-25 kindergartners got their required measles-mumps-rubella shots, down slightly from . Before the COVID-19 pandemic, the vaccination rate was 95% — the level that makes it unlikely that a single infection will spark a disease cluster or outbreak.

The vaccination numbers were posted as the U.S. experiences its worst year for in more than three decades, with more than 1,300 cases so far.

The Centers for Disease Control and Prevention traditionally releases the vaccination coverage data in its flagship publication, the Morbidity and Mortality Weekly Report. CDC officials usually speak to the trends and possible explanations, and stress the importance of vaccinations. This year, the agency quietly posted the data online and — when asked about it — emailed a statement.

“The decision to vaccinate is a personal one. Parents should consult their health care providers on options for their families,� the statement said, adding; “Vaccination remains the most effective way to protect children from serious diseases like measles and whooping cough, which can lead to hospitalization and long-term health complications.�

Public health officials focus on vaccination rates for kindergartners because schools can be cauldrons for germs and launching pads for community outbreaks.

For years, those rates were high, thanks largely to school attendance mandates that required key vaccinations. All U.S. states and territories require that children attending child care centers and schools be vaccinated against , including, measles, mumps, polio, tetanus, whooping cough and chickenpox.

All states allow exemptions for children with medical conditions that prevent them from receiving certain vaccines. And most for religious or other nonmedical reasons.

In the last decade, the percentage of kindergartners with medical exemptions has held steady, at about 0.2%. But the percentage with nonmedical exemptions has risen.

The rates can be influenced by policies that make it harder or easier to obtain exemptions, and by local attitudes among families and doctors about the need to get children vaccinated. Online misinformation and that emerged around COVID-19 vaccines have led more parents to question routine childhood vaccinations, experts say.

According to the CDC data, 15.4% of kindergartners had to one or more vaccines in Idaho in the last school year. But fewer than 0.5% did in Connecticut.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.