A Trump-appointed official blocked the release of a Centers for Disease Control and Prevention (CDC) study examining COVID-19 vaccine effectiveness, according to internal documents obtained by The Washington Post. The study, which used a standard test-negative case-control design to assess vaccine performance, was set to publish in the CDC's Morbidity and Mortality Weekly Report (MMWR) but was halted by Secretary of Health and Human Services Alex Azar's deputy, Dr. Scott Gottlieb. The official flagged concerns about the methodology used to calculate vaccine effectiveness, prompting a review by the agency's scientific team. This intervention occurred just a week before the study's planned publication, raising questions about political interference in scientific communication.

This isn't the first time the Trump administration has interfered with CDC communications. Former CDC director Brenda Fitzgerald resigned last year amid controversy over her ties to pharmaceutical companies, and Dr. Dan Jernigan, who headed the CDC's influenza division for six years, resigned in protest over political meddling. Jernigan suggested the current stalling aligns with Secretary Kennedy's broader anti-vaccine agenda, noting he has already moved to restrict vaccine availability for children. The blocked study's findings could have countered narratives questioning vaccine efficacy, particularly regarding hospitalization prevention.

The CDC maintains its scientific team is addressing the concerns raised, but the delay underscores ongoing tensions between public health science and political oversight. The eventual publication may face further scrutiny, potentially altering public perception of vaccine effectiveness just as new variants emerge.