Measles Comeback Risk: Exemptions Explode

Kindergarten vaccine exemptions hit another record, pushing school immunity to its thinnest edge in years.

Story Snapshot

Exemptions from one or more vaccines rose to 3.6% in 2024–2025, a new high.
More than half of states saw increases, with many topping 5% exemption rates.
Most exemptions are nonmedical, not doctor-advised medical exceptions.
Coverage has slid for several years, raising outbreak risk in low-coverage pockets.

Record exemptions and the shrinking safety margin

Federal data show the share of U.S. kindergartners with an exemption from at least one required vaccine rose to 3.6% in the 2024–2025 school year, up from 3.3% the year before. Exemptions climbed in 36 states and the District of Columbia, and 17 states reported rates above 5%.

That number may sound small. It is not. Exemptions tend to cluster in the same schools and zip codes, where they can pull local protection below the line that stops the spread of fast-spreading diseases.

Federal surveillance tracks measles, mumps, rubella, diphtheria, tetanus, pertussis, polio, and varicella as the core school-entry set. Kindergarten laws vary by state, but nearly all require these vaccines to enroll, with defined paths for medical and, in most states, nonmedical exemptions.

When exemption rates rise and coverage slips simultaneously, the system relies on luck and geography. That is not a public health plan; that is roulette.

School vaccination rates inch down again to record low as exemptions reach new high. https://t.co/FyfOtQiufc

— CBS News (@CBSNews) August 17, 2026

The multi-year trend is real, not a one-off blip

Centers for Disease Control and Prevention reporting shows that exemptions have been rising year after year since the pandemic disruption. The national rate moved from 2.6% in 2021–2022 to 3.0% in 2022–2023, then to 3.3% in 2023–2024, and now 3.6% in 2024–2025.

Public health outlets and academic reviews have described steady declines in coverage alongside parallel growth in exemptions, rather than a spike that then fades. A long slope is harder to fix than a short bump; habits and policies harden over time.

Most exemptions are not medical. Federal analysis for earlier years showed medical exemptions at about two-tenths of one percent, with nonmedical exemptions making up the rest. That split has policy fingerprints.

States that make exemptions easy to file tend to see more of them. States that ask for counseling, signatures, or renewal steps tend to see fewer. Process design sounds dull, but it shapes real outcomes. Parents respond to the path of least resistance, just like everyone else.

Why the numbers matter at the school door

Measles is the clearest risk signal because it spreads fast and needs very high coverage to stall. National coverage estimates for measles, mumps, and rubella have drifted down several points from pre-pandemic highs, leaving more than a quarter million kindergartners without documented measles shots in recent counts.

Those children are not evenly spread. A few classrooms with many exemptions can invite an outbreak that then targets babies, cancer patients, and others who cannot be vaccinated.

Routine kindergarten vaccination coverage in the United States declined for the fourth consecutive year during the 2024–2025 school year, while non-medical vaccine exemptions reached an all-time high, according to data released by the…

FOR MORE: https://t.co/MxYYX7SMgH pic.twitter.com/2SdcRouh8O

— WGOD (@wgodnet) August 18, 2026

Local officials have tools that line up with parental rights. Schools can tighten paperwork checks and stop rubber-stamping blanket waivers.

States can retain medical exemptions for true contraindications while setting clear steps for nonmedical claims, such as annual renewal or counseling. Those measures respect choice but ask for commitment.

The experience of stricter states suggests these steps cut casual exemptions without blocking families with firm beliefs. Taxpayers fund schools to be safe, not lucky.

What to watch next

Watch three signals this year. First, whether exemption rates cross 5% in more states, since that level often pairs with local outbreaks. Second, whether coverage rebounds as schools finish audits, which sometimes bring in late records; recent years show that the rebound is too small to change the story.

Third, whether states adjust rules on how nonmedical exemptions are requested and renewed; small policy shifts can move behavior at scale. The trend will not fix itself.