CDC Sat on a Report Showing the COVID Vaccine Halved ER Visits and Hospitalizations

The CDC Had Data Showing the COVID Vaccine Cut Hospitalizations in Half — and Held It Back

In April 2026, two CDC scientists — speaking anonymously out of fear of retaliation — told the Washington Post that the agency had delayed publication of a report showing the COVID-19 vaccine substantially reduced severe outcomes in healthy adults over the previous winter. The findings were not ambiguous: roughly a 50% reduction in urgent-care and emergency-department visits, and about a 55% reduction in COVID-related hospitalizations.

The Journal It Was Headed For

The report was slated for the March issue of the Morbidity and Mortality Weekly Report (MMWR), the CDC's premier scientific publication. Getting into MMWR is the normal path for the CDC to communicate findings to doctors and the public. Pulling a study from that pipeline is a deliberate act.

Who Held It

According to an HHS spokesperson, Dr. Jay Bhattacharya — acting CDC director and NIH director — 'expressed concerns about the observational method used in this study to calculate vaccine effectiveness.' The problem with that explanation: a study using the very same observational methodology had been published in the CDC journal just a week earlier. The difference was that the earlier study examined flu vaccines, not COVID.

The Pattern

This episode preceded by weeks the May 2026 revelation that the FDA blocked two peer-reviewed studies affirming COVID and shingles vaccine safety. Taken together, scientists and reporters described a consistent direction: research showing vaccines work or are safe was being delayed or withheld at federal health agencies, while methodologically identical research on other topics moved forward.