Natalie Dean, a biostatistics expert at Emory University, watched as a long-delayed study on COVID-19 vaccine effectiveness finally made its way into the scientific record — not through the CDC’s flagship journal, but through JAMA Network Open, after political interference stalled its publication for months. The research, once blocked by Trump-era appointees at the Centers for Disease Control and Prevention, delivers a clear message: vaccines significantly reduced the most serious outcomes of the pandemic. In the United States, they were 55% effective at preventing hospitalizations linked to COVID-19 and cut emergency department and urgent care visits by half. These numbers, while consistent with prior findings, carry added weight given the controversy surrounding their release.
The study used a well-established method known as the "test-negative design," which compares vaccinated and unvaccinated patients seeking care for respiratory symptoms, then analyzes how many test positive for the virus. This approach has been peer-reviewed and published in top journals like the New England Journal of Medicine and Pediatrics, and is considered one of the best tools for measuring real-world vaccine performance during fast-moving outbreaks. Yet when the CDC’s Morbidity and Mortality Weekly Report (MMWR) prepared to publish it this spring, acting agency director Jay Bhattacharya intervened. Though the paper had passed scientific review by the CDC’s Office of Science, Bhattacharya raised concerns about assumptions in the model, particularly around prior infections and patient behavior.
CDC chief science officer Althea Grant-Lenzy clarified that the hold did not mean permanent suppression — authors were free to submit elsewhere, which they ultimately did. Still, the episode reignited debate over political influence in public health science. In response, the CDC hosted a forum featuring experts like Dean, who defended the methodology as both rigorous and timely. But the panel also included Martin Kulldorff, a controversial biostatistician and co-author of the Great Barrington Declaration, who questioned the study’s scope and design. His presence underscored the deep divisions that continue to shape vaccine discourse.
Despite the noise, the data stand firm. At a moment when public trust in vaccines wavers and misinformation spreads faster than ever, having transparent, peer-reviewed evidence matters. As Dean wrote in her accompanying commentary, “It is critical that we continue to characterize and publish estimates of vaccine effectiveness in populations with changing immunity against evolving viral strains.” That principle isn’t just about science — it’s about accountability, timeliness, and the public’s right to know what works. With this study now officially in the scientific literature, its findings can’t be buried. And perhaps more importantly, they can be used — to guide policy, inform clinicians, and reassure a weary public that vaccines still save lives.