Kindergarten MMR Vaccination Rates Decline, Exemptions Rise Amidst Measles Surge

What Happened

The Centers for Disease Control and Prevention (CDC) announced on Monday, August 17, 2026, that vaccination coverage for measles, mumps, and rubella (MMR) among kindergarteners in the United States remains below the optimal rate required to prevent widespread outbreaks. The CDC's latest figures for the 2025-2026 school year indicate a decline in overall vaccination rates, with exemptions for one or more vaccines increasing to 4.2% from 3.6% in the preceding school year. This rise in exemptions was observed in 41 states and Washington, D.C., with 24 of these jurisdictions reporting exemption rates exceeding 5%. Concurrently, the U.S. has recorded 2,566 confirmed measles infections so far this year, marking the highest number of cases in over 35 years. This public health update follows an executive order signed last week by U.S. President Donald Trump, which called for fewer childhood vaccinations by limiting the inoculation schedule to 11 immunizations and recommended splitting the MMR vaccine into three separate shots.

What the Evidence Establishes

Evidence from the CDC's August 17, 2026, report establishes a clear trend of declining kindergarten vaccination coverage. Specifically, MMR vaccine coverage stood at 92.4% for the 2025-2026 school year, matching the polio vaccine rate, while the diphtheria, tetanus, and acellular pertussis vaccine (DTaP) coverage was 92%. These figures fall short of the CDC's recommended 95% threshold necessary for herd immunity to effectively prevent measles outbreaks. The data further indicates that approximately 280,000 kindergartners attended school during the 2025-2026 academic year without documented completion of the MMR vaccine series. The increase in vaccine exemptions, from 3.6% to 4.2% year-on-year, directly correlates with a 0.1% overall decline in kindergarten vaccination coverage. This decline has occurred since the onset of the COVID-19 pandemic, a period that has also seen a dramatic increase in measles cases, reaching 2,566 confirmed infections this year, a level not seen in over three decades.

Where the Accounts Conflict

The provided source accounts from The Hill and CNBC largely corroborate the core findings of the CDC report regarding declining kindergarten vaccination rates and rising exemptions. Both outlets cite the CDC's data released on Monday, August 17, 2026, confirming that MMR vaccine coverage is below the ideal rate for preventing outbreaks. However, a subtle difference in emphasis is observable. The Hill's reporting focuses broadly on the

Context and Stakes

The current decline in kindergarten vaccination rates and the concurrent surge in measles cases are situated within a critical public health context. Historically, the measles vaccine has been highly effective, leading to a significant reduction in cases in the United States. However, the CDC's long-standing recommendation of 95% vaccination coverage for two doses of the measles vaccine is crucial for achieving herd immunity, which protects individuals who cannot be vaccinated, such as infants or those with compromised immune systems. The reported 92.4% MMR coverage for the 2025-2026 school year, coupled with 4.2% exemptions, places many communities below this critical threshold, increasing vulnerability to outbreaks. The 2,566 confirmed measles infections this year represent the highest incidence in over 35 years, underscoring the immediate public health risk. This trend has been exacerbated by a steady decline in childhood MMR vaccination rates observed since the start of the COVID-19 pandemic, which disrupted routine healthcare and fueled vaccine hesitancy. President Trump's recent executive order, advocating for fewer childhood vaccinations and a split MMR schedule, introduces a significant policy variable that could further influence public perception and vaccination uptake, potentially complicating efforts to restore herd immunity levels.

What to Watch Next

Observers should monitor several key developments following the CDC's report. First, attention will be on the specific responses from state and local public health authorities, particularly in the 41 states and Washington, D.C. where exemption rates increased, and the 24 states where exemptions exceeded 5%. These jurisdictions may consider implementing targeted public health campaigns or reviewing existing school vaccination policies to address the decline. Second, the impact of President Trump's executive order, signed last week, on public sentiment and parental decisions regarding childhood immunizations will be a critical area of observation. The order's recommendation to limit the inoculation schedule to 11 immunizations and split the MMR vaccine into three shots could lead to further shifts in vaccination patterns. Third, the trajectory of measles infections will be closely watched; a continued rise could prompt more urgent interventions from federal health agencies. Finally, any legislative responses from Congress or state legislatures to either support or counter the executive order's stance on vaccination schedules will indicate the political landscape surrounding public health policy in the coming months.

Bottom Line

Kindergarten vaccination coverage for MMR and other key childhood diseases in the U.S. has fallen below the critical 95% threshold needed to prevent widespread outbreaks, with exemptions rising to 4.2% during the 2025-2026 school year. This decline coincides with the highest number of measles cases in over 35 years, totaling 2,566 confirmed infections this year. The CDC's data, released on August 17, 2026, highlights a concerning trend exacerbated since the COVID-19 pandemic. President Trump's recent executive order advocating for fewer childhood vaccinations and a split MMR schedule introduces a new policy dimension that could further influence these trends. The immediate consequence is an increased vulnerability to preventable disease outbreaks across communities, necessitating close monitoring of public health responses and policy adjustments at both federal and state levels to mitigate the risks associated with reduced immunization rates.