MEDPAGE  TODAY reports that U.S. kindergarten vaccination rates inched down again last year and the share of children with exemptions rose to an all-time high, according to federal data posted Monday.

The fraction of kids exempted from vaccine requirements rose to 4.2%, up from 3.6% the year before. That's an estimated 155,000 children nationally during the 2025-2026 school year.

It's the fourth consecutive year that the national average exemption rate has reached a new record, and the vast majority are parents withholding shots for nonmedical reasons. Exemptions increased in 41 states and the District of Columbia.

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