Blocked CDC Study on COVID-19 Vaccine Efficacy Now Published, Showing Reduced Hospitalizations

A study led by CDC epidemiologists, which was reportedly withheld internally, has now been published in JAMA Network Open. The research indicates that the 2025–26 COVID-19 vaccine significantly reduced hospitalizations by approximately 55% and emergency department visits by about 50% for vaccinated adults compared to unvaccinated individuals. The publication of this previously blocked data provides important insights into vaccine effectiveness.