What to know about COVID-19 study that was published after being blocked by CDC
Summary
A study on the effectiveness of the 2025-26 COVID-19 vaccine was published after being blocked from a CDC weekly report. The study found the vaccine reduced hospitalizations and emergency visits related to COVID-19 by about half among adults without weakened immune systems.Key Facts
- The study was done by CDC researchers and researchers from 10 U.S. states.
- It focused on adults aged 18 and older during fall and winter of 2025.
- The vaccine lowered the risk of hospitalization by 55% and emergency or urgent care visits by 50%.
- The study did not consider if people had previous COVID-19 infections or vaccines.
- The study was originally blocked from the CDC’s Morbidity and Mortality Weekly Report in March.
- CDC acting Director Dr. Jay Bhattacharya raised concerns about the study’s test-negative design method.
- The CDC said they review studies carefully to ensure scientific accuracy before publishing.
- Experts said blocking the study was surprising because it showed vaccines work to prevent serious illness.
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