Non-medical vaccine exemptions are rising to record levels

In the 2024-2025 school year, 3.6% of US kindergartners claimed a non-medical exemption from at least one required vaccine -- the highest national exemption rate ever recorded, up from 2.5% in 2019-2020. In 47 states plus DC, parents can claim religious or philosophical exemptions with minimal scrutiny; in many states, the process is as simple as checking a box on a form. So what? These exemptions cluster geographically. A school with 95% vaccination coverage has herd immunity; a school with 85% does not. When exemptions concentrate in specific schools or communities, those micro-populations become vulnerable to outbreaks even if the state-level average looks adequate. So what? Measles outbreaks in 2024 increased 17-fold compared to 2020-2023, and they occurred precisely in these high-exemption clusters. So what? Outbreaks force school closures, quarantine hundreds of exposed children (including those too young to be vaccinated or with medical contraindications), and cost public health departments hundreds of thousands of dollars per outbreak to contain. Why does this persist? Exemption laws are politically contentious. Legislators face organized anti-vaccine advocacy groups. States that have tried to tighten exemption requirements (like removing philosophical exemptions) face intense political backlash. Meanwhile, states like West Virginia are moving in the opposite direction -- the governor signed an executive order in January 2025 allowing religious and personal belief exemptions for the first time.