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JAMA NetworkCOVID-19-Associated Hospitalizations Among Vaccinated and Unvaccinated Adults 18 Years or Older in 13 US States, January 2021 to April 2022

In this cross-sectional study of US adults hospitalized with COVID-19 during January 2022 to April 2022, hospitalization rates from COVID were 10.5 times higher in unvaccinated persons and 2.5 times higher in vaccinated persons with no booster dose, respectively, compared with those who had received a booster dose.