GoKawiilUnder anti-vaccine Health Secretary Robert F. Kennedy Jr., scientists at the Centers for Disease Control and Prevention have been blocked from publishing a scientifically vetted study finding significant health benefits from this season’s COVID-19 vaccines, according to reporting by The Washington Post.
The move adds to longstanding concern among health experts that chaos and political interference under Kennedy—a staunch anti-vaccine activist who has long falsely maligned COVID-19 vaccines—is deeply undermining science at federal agencies and beyond.
CDC scientists and insiders told the Post that the COVID-19 vaccine study went through the agency’s standard scientific review process and was slated for publication on March 19 in the agency’s Morbidity and Mortality Weekly Report (MMWR). But acting CDC director Jay Bhattacharya blocked the scheduled publication and is holding the study, claiming he has concerns about its methodology.
Agency scientists talked with the Post on the condition of anonymity for fear of retaliation from the Trump administration.
According to a summary the Post obtained, the study concluded that between September and December of last year, healthy adults vaccinated with a 2025–2026 COVID-19 vaccine saw the risk of emergency department or urgent care visits cut by 50 percent, and the risk of COVID-19-associated hospitalizations cut by 55 percent, compared with healthy adults who did not get this season’s shot.
Bhattacharya reportedly took issue with the test-negative design of the study, which is a well-established method to examine real-world data on vaccine effectiveness. This type of observational study looks at people who have symptoms related to the disease of interest (in this case, COVID-19) and have the same test-seeking behavior. Those who test positive for the disease of interest become positive cases in the study, and those who test negative are test-negative controls. Researchers then compare the two groups based on vaccination status.