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FILE - A sign outside the Centers for Disease Control and Prevention campus in Atlanta is seen as a meeting of the Advisory Committee in Immunization Practices takes place on Wednesday, June 25, 2025. (AP Photo/Mike Stewart, File)

U.S. kindergarten vaccination rates inched down again last year and the proportion of children with exemptions rose to an all-time high. The fraction of kids exempted from vaccine requirements rose to a new all-time high of 4.1%, up from 3.3% the year before. It’s the third record-breaking year in a row for the exemption rate. The vast majority are parents eschewing shots for nonmedical reasons. The Centers for Disease Control and Prevention quietly posted the data Thursday on its website. Public health officials focus on vaccination rates for kindergartners because schools can be cauldrons for germs and launching pads for community outbreaks.

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FILE - Vials of the measles mumps and rubella (MMR) vaccine are displayed in Lubbock, Texas, on Tuesday, Feb. 25, 2025. (AP Photo/Julio Cortez, File)

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FILE - A healthcare worker prepares a shot of the Pfizer COVID-19 vaccine in La Paz, Bolivia, Jan. 7, 2025. (AP Photo/Juan Karita, File)

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Measles cases in the U.S. are at their highest in three decades. The U.S. Centers for Disease Control and Prevention says the U.S. has 1,288 cases since the beginning of the year. That’s higher than 2019, when there 1,274 cases driven by 22 outbreaks over 12 months. Seventeen states have seen outbreaks this year. Experts fear the U.S. may lose its status as having eliminated measles. There are also large outbreaks of the vaccine-preventable disease in Mexico and Canada.