Introduction

National data released in August 2026 show that kindergarten vaccination coverage in the United States is continuing to decline. The measles‑mumps‑rubella (MMR) immunization rate fell to 92.4% during the 2025‑2026 school year, down from 92.5% the previous year and markedly lower than the 95.2% level recorded in 2019‑2020. At the same time, exemption rates have risen to a new peak, signaling growing challenges for public health and school safety.

Rising Exemptions and Their Scope

The overall exemption rate for kindergartners reached 4.2% in the most recent school year, up from 3.6% the year before and 2.2% in the 2020‑2021 cycle. This increase represents roughly 155,000 children nationwide who are enrolled without meeting the recommended immunization standards. Exemptions grew in 41 states and the District of Columbia, with the majority of parents citing nonmedical reasons for opting out of vaccines.

Impact on Vaccine Coverage

The decline in vaccination rates is not limited to MMR. The data indicate reduced coverage across all routine childhood vaccines, including polio. Approximately 280,000 kindergartners entered school without completing the full MMR series, highlighting a broader gap in herd immunity. These trends raise concerns about the potential for preventable disease outbreaks in school settings and the surrounding communities.

Policy Context and Future Outlook

Policy developments may be influencing parental decisions. In the week prior to the data release, the President signed an order that reduced the number of recommended childhood vaccines to 11 and called for the MMR vaccine to be administered as separate doses across multiple visits. The order also directed the national health agency to expand vaccine research. While the long‑term effects of this policy are not yet clear, the timing coincides with the observed rise in nonmedical exemptions.

Conclusion

The persistent drop in kindergarten vaccination rates, coupled with record‑high exemption levels, underscores a pressing public health challenge. Continued monitoring, targeted education, and clear policy guidance will be essential to protect children and preserve community immunity as the United States moves forward.