Vaccination Coverage Drops for Sixth Consecutive Year
The Centers for Disease Control and Prevention (CDC) released new data on Monday showing that vaccination rates among American kindergartners have declined for the sixth straight year, while the proportion of children with exemptions from school vaccine requirements has reached an all-time high. The findings, posted quietly on the agency's website without the usual accompanying report, underscore the growing challenge of maintaining herd immunity against preventable diseases such as measles, whooping cough, and chickenpox.
For the 2025–2026 school year, only 92.4% of kindergartners received the measles, mumps, and rubella (MMR) vaccine, a slight decrease from 92.5% the previous year. Coverage for the DTaP vaccine, which protects against diphtheria, tetanus, and pertussis, also slipped to 92.0% from 92.1%. These figures represent a continued erosion from the 2019–2020 school year, when national coverage stood at approximately 95%—the threshold widely considered necessary to prevent community outbreaks of vaccine-preventable diseases.
Exemptions Surge to 4%
More alarming than the modest decline in vaccination rates is the sharp rise in nonmedical exemptions. In the 2025–2026 school year, 4% of kindergartners had a nonmedical exemption—meaning their parents opted them out of required vaccines for personal or religious beliefs. This is up from 3.2% the previous year, representing a 25% relative increase in just one year. Medical exemptions, which are granted for genuine health reasons, remained stable at 0.2%.
The CDC tracks exemptions because they directly reduce the 'potentially achievable' vaccination coverage. While some children may be unvaccinated due to barriers like lack of access to healthcare, those with nonmedical exemptions are intentionally unvaccinated. When the overall exemption rate in a community exceeds 5%, herd immunity is compromised, leaving vulnerable populations—such as infants too young to be vaccinated or immunocompromised individuals—at greater risk.
State-by-State Breakdown
The data reveals significant geographic disparities. More than half of states reported decreases in coverage for MMR, DTaP, polio, and varicella (chickenpox) vaccines. Only ten states managed to maintain MMR vaccination rates at or above the 95% threshold: West Virginia, Connecticut, Maine, New York, Mississippi, Rhode Island, Maryland, Massachusetts, California, and New Mexico. These states tend to have stricter school vaccine requirements or fewer exemption options.
In contrast, states with lenient exemption laws or easy access to nonmedical exemptions are seeing the steepest declines. For instance, states like Idaho, Arizona, and Oregon have historically high exemption rates, and the new data suggests the trend is worsening. The CDC's decision to publish the data without a full report has drawn criticism from public health experts, who argue that transparency is crucial for addressing the issue.
Public Health Implications
The continued decline in vaccination rates poses a real threat to public health. Measles, which was declared eliminated in the US in 2000, has seen sporadic outbreaks in recent years, often originating from communities with low vaccination coverage. Whooping cough, a highly contagious respiratory infection, can be fatal for infants, and its incidence has been rising in areas with low DTaP uptake.
Dr. Paul Offit, a vaccine expert at Children's Hospital of Philadelphia, noted that the trend is 'deeply concerning' and reflects a persistent misinformation problem. 'We are seeing the consequences of decades of anti-vaccine rhetoric that has eroded public trust in a safe and effective intervention,' he said in an interview. 'The fact that exemptions are rising faster than coverage is falling suggests that more parents are actively choosing not to vaccinate their children.'
Potential Causes and Responses
The rise in exemptions is often attributed to a combination of factors, including the spread of misinformation on social media, vaccine hesitancy fueled by the COVID-19 pandemic, and the politicization of public health measures. In some states, legislative efforts to expand exemption options have made it easier for parents to opt out. For example, several states have considered bills that would allow exemptions based on 'conscience' or 'personal belief' without requiring a signed form or counseling.
Public health officials are exploring strategies to reverse the trend. These include targeted vaccination clinics in underserved areas, school-based education programs, and stronger enforcement of school entry requirements. Some states have implemented 'exemption education' policies, where parents must consult with a healthcare provider before receiving a nonmedical exemption, but the effectiveness of such measures is still under study.
Looking Ahead
The CDC's data release, though lacking a comprehensive report, serves as a stark reminder that the US is falling behind in its vaccination goals. With the 2026–2027 school year approaching, health officials are urging parents to ensure their children are up to date on all recommended vaccines. 'Vaccines are one of the most effective public health interventions we have,' said Dr. Sandra Fryhofer, an internal medicine physician and former chair of the American Medical Association's Board of Trustees. 'We cannot afford to let preventable diseases make a comeback.'
As the nation grapples with this growing crisis, the hope is that the data will spur action at both the state and federal levels. Whether through policy changes, community outreach, or increased funding for immunization programs, the goal remains clear: to protect the most vulnerable by achieving and maintaining high vaccination coverage across all communities.
This article is based on reporting by Ars Technica. Read the original article.
Originally published on arstechnica.com
