Vaccine Exemptions: Are We Putting Communities at Risk?
"A closer look at nonmedical exemptions and their potential impact on public health."
Vaccines stand as one of the monumental achievements of modern medicine, effectively eradicating or significantly reducing the incidence of numerous infectious diseases. These diseases, once rampant, posed severe threats to public health globally. However, the effectiveness of vaccines hinges on widespread adoption, creating what is known as herd immunity—a protective barrier where a high percentage of the population is immune, thereby safeguarding those who cannot be vaccinated, such as infants or individuals with certain health conditions.
In recent years, a growing number of parents have sought nonmedical exemptions (NMEs) from mandatory vaccination requirements for their children. These exemptions, often rooted in philosophical or religious beliefs, have sparked considerable debate among healthcare professionals, policymakers, and the public. As NME rates rise, concerns mount about the potential erosion of herd immunity and the subsequent resurgence of vaccine-preventable diseases.
This article delves into the complex landscape of vaccine exemptions in the United States, focusing on a detailed examination of nonmedical exemptions across different states and counties. By analyzing trends and geographical hotspots, we aim to shed light on the factors driving this movement and its potential implications for public health. Understanding these dynamics is crucial for developing effective strategies to promote vaccination and protect communities from preventable diseases.
Rising School Exemptions
During the 2025-2026 school year, exemptions from one or more vaccines among U.S. kindergartners increased to 4.2%, up from 3.6% the previous year. Exemptions increased in 41 states and the District of Columbia, while 24 states reported exemption rates above 5%. About 155,000 kindergartners were exempt from one or more vaccines during that school year.
Understanding Hesitancy
Vaccine hesitancy is increasingly used in vaccination discourse and has prompted substantial research into factors influencing vaccine acceptance and refusal. The New England Journal of Medicine describes hesitancy as existing along a spectrum, with many hesitant parents motivated to protect their children but concerned about vaccine safety. Strategies to reduce nonmedical exemptions therefore emphasize understanding specific concerns, maintaining trust, and preserving community immunity rather than relying only on punishment or mandates.
Where Are Vaccine Exemptions Most Common?
Since 2009, there's been a noticeable increase in philosophical-belief vaccine nonmedical exemptions (NMEs) in many states that allow this policy. Specifically, 12 out of 18 states have seen a rise in these exemptions. These states include Arizona, Arkansas, Idaho, Maine, Minnesota, Missouri, North Dakota, Ohio, Oklahoma, Oregon, Texas, and Utah.
- Arizona (Maricopa County): Home to Phoenix, this county reports the highest number of NMEs, indicating significant parental hesitancy towards vaccinations.
- Utah (Salt Lake and Utah Counties): With major cities like Salt Lake City and Provo, these counties also show high exemption rates, reflecting regional trends.
- Washington (King and Spokane Counties): Including Seattle and Spokane, these counties in Washington contribute substantially to the state’s overall NME numbers.
- Oregon (Multnomah County): Centered around Portland, this county is another key area where nonmedical exemptions are frequently claimed.
- Texas (Harris, Tarrant, Collin, and Travis Counties): Featuring cities like Houston, Fort Worth, Plano, and Austin, these counties collectively represent a large portion of Texas’s NME figures.
- Michigan (Oakland, Macomb, and Wayne Counties): Encompassing areas such as Troy, Warren, and Detroit, these counties highlight vaccine exemption trends in the Midwest.
- Missouri (Jackson County): Including Kansas City, this county shows notable NME numbers compared to other areas in Missouri.
Recent Evidence and Outbreaks
From January 1 through March 20, 2025, 17 U.S. states reported 378 measles cases and two deaths, the first measles-related deaths in the United States in a decade. Recent research describes nonmedical vaccine exemptions as increasingly common and warns that they threaten population immunity among children. CDC reporting also found that nonmedical exemptions represented more than 93% of reported exemptions and accounted for almost all of the national increase.
Mixed Evidence and Misinformation
One longitudinal analysis reported that the restrictiveness of nonmedical-exemption laws and vaccine uptake were not associated with incidence rates for hepatitis B, Haemophilus influenzae type B, measles, or mumps. Other reviews emphasize that vaccine hesitancy can prevent the establishment or maintenance of herd immunity. The Cleveland Clinic describes misinformation, trust, and communication as central challenges requiring tailored, evidence-based responses from health professionals.
Clusters and Community Risk
Research on nonmedical exemptions describes how accumulating susceptible children, including those whose vaccination is deferred, can erode community protection enough to permit disease outbreaks. In a study of pertussis in California in 2010, census tracts within an exemption cluster were 2.5 times more likely to be in a pertussis cluster. The reported odds ratio was 2.47, with a 95% confidence interval of 2.22 to 2.75.
Why This Matters
The high numbers of nonmedical exemptions in densely populated urban areas suggest that outbreaks of vaccine-preventable diseases could either start or spread quickly through these groups of unvaccinated or partly vaccinated children. The fact that the most vaccine-exempt children live in big cities with busy international airports might make this risk even greater. Continuous monitoring, community-based education, and policy adjustments are essential to address vaccine hesitancy and protect public health.
Policy Tradeoffs
California's 2016 policy eliminating nonmedical vaccine exemptions has been examined through an empirical policy analysis of changes in vaccine coverage. Other expert commentary argues that unencumbered mandates, which govern and penalize non-vaccination without exemptions, create implementation and enforcement problems for America's underfunded public health system. Communities have also pursued different reforms, including eliminating nonmedical exemptions, limiting them to religious objections, or making them more difficult to obtain.
Trust and Outreach
Recent expert analysis identifies population-level outreach and effective vaccine communication as central to addressing hesitancy and restoring or maintaining trust in vaccination systems. The review focuses on the history of vaccination and hesitancy in the United States, recent and ongoing outbreaks, and psychology-based tools for addressing vaccine decisions. It also calls for continued research into outreach, message development, and implementation.
Barriers and Consequences
In rural areas, vaccine hesitancy and behavior can be influenced by health care access challenges, misinformation, political loyalties, and concerns about limited trustworthy evidence or knowledge of long-term effects. A bioethics case study describes Jennifer, a 44-year-old critically ill patient with COVID-19 and multi-system organ failure after previously refusing vaccination. These examples show how policy questions intersect with access, trust, personal autonomy, and severe individual consequences.