CDC blocks report showing covid shots cut hospital visits by half

The Centers for Disease Control and Prevention prepared to publish a report showing that the 2025-2026 covid vaccine cut emergency department visits and hospitalizations for healthy adults by about half, then pulled it from publication after it had already cleared scientific review. The study had been scheduled for the agency’s Morbidity and Mortality Weekly Report on March 19, 2026.

The decision landed at a sensitive moment for public health communication, because the report appeared to reinforce the CDC’s own message that vaccination still helps prevent severe illness, hospitalization and death. The agency’s guidance issued on November 4, 2025 says the 2025-2026 covid vaccine is recommended for people ages 6 months and older through individual-based decision-making, with the clearest benefit for people at higher risk of severe disease.

Jay Bhattacharya, who is performing the delegable duties of CDC director as of April 1, 2026, raised concerns about the paper’s observational methodology, according to HHS spokesperson Andrew Nixon. The CDC and the Department of Health and Human Services have said leadership review of MMWR papers is routine and is meant to ensure methodological rigor. Bhattacharya, a Stanford University professor and coauthor of the Great Barrington Declaration, was the official who decided the report would not be published.

The controversy is not about whether the vaccine was studied carefully, but about what kind of evidence federal health leaders are willing to let the public see. The report used a test-negative design, a long-standing epidemiologic method that the CDC and other researchers have used for respiratory-virus studies for years. The CDC’s own vaccine-effectiveness page says observational studies provide timely evidence to guide policy recommendations.

That context matters because the agency has recently published similar evidence. In a February 27, 2025 MMWR, the CDC said the 2024-2025 covid vaccine was 33% effective against emergency department or urgent care visits among adults 18 and older, and 45% to 46% effective against hospitalizations among immunocompetent adults 65 and older. The same report said vaccination averted about 68,000 hospitalizations during the 2023-2024 respiratory season.

Suppressing or delaying favorable data does more than stall a paper. It can deepen suspicion that federal health agencies are filtering science through politics, especially amid broader turmoil at CDC and HHS and continuing criticism from public-health experts who worry that vaccine skepticism at the top is shaping what the public is allowed to know.