cdc / covid-19 vaccine / morbidity and mortality weekly report

Acting CDC director Jay Bhattacharya has delayed publication of a CDC study that found Covid vaccination halved emergency visits and cut hospitalizations by about 55% among healthy adults last winter, citing methodological concerns. The research used the CDC’s longstanding test-negative design, a common approach for vaccine effectiveness studies, and was scheduled for the agency’s Morbidity and Mortality Weekly Report on 19 March. Former CDC advisers and public-health experts, including Fiona Havers, say the delay reflects political interference from the Trump administration and health secretary Robert F. Kennedy Jr., who has publicly criticized Covid vaccines. The pause has raised alarm about threats to CDC scientific independence and potential impacts on public trust and vaccine policy ahead of the 2026 midterms.

Acting CDC director Jay Bhattacharya has delayed publication of a CDC study showing Covid vaccines reduced emergency visits and hospitalizations for healthy adults by roughly half last winter, citing methodological concerns. The study—using the CDC’s longstanding test-negative design and due to appear in the agency’s Morbidity and Mortality Weekly Report—was pulled days before its March 19 publication as Bhattacharya reviews the methods and will meet with CDC scientists. Former CDC advisers and public health experts warn the postponement follows a pattern of political appointee interference from the Trump administration and health secretary Robert F. Kennedy Jr., who has publicly criticized Covid vaccines. The delay raises alarms about politicization of vaccine science and potential impacts on public health guidance.

CDC scientists say a peer-reviewed study showing this season’s COVID-19 vaccine cut emergency/urgent care visits by 50% and hospitalizations by 55% in healthy adults was blocked from publication in the agency’s MMWR by acting CDC director Jay Bhattacharya, reporting by The Washington Post finds. The study used a widely accepted test-negative case-control design—the same method used in recent CDC flu-vaccine analyses—which Bhattacharya reportedly questioned on methodological grounds. Agency sources, speaking anonymously, and former CDC officials see the hold as part of political interference under Health Secretary Robert F. Kennedy Jr., an anti-vaccine advocate. The dispute matters because it touches on scientific independence, public trust, and communication of vaccine benefits during ongoing COVID policy decisions.

A CDC study showing substantial health benefits from this season's COVID-19 vaccines was blocked from publication by acting CDC director Jay Bhattacharya, according to The Washington Post. CDC scientists say the paper cleared the agency's normal scientific review and was due to run in the Morbidity and Mortality Weekly Report on March 19, but Bhattacharya halted release citing methodological concerns. The suppression occurred under Health Secretary Robert F. Kennedy Jr., an outspoken anti-vaccine figure, prompting fears of political interference undermining federal scientific processes. The episode matters for public trust in health and data-driven policy, and raises alarm about political influence over scientific communication during ongoing public-health management.