About The Study: In this study that included 1,199 U.S. essential and frontline workers with SARS-CoV-2 infections, recent vaccination with 2 or 3 mRNA vaccine doses less than 150 days before infection with Delta or Omicron variants, compared with being unvaccinated, was associated with attenuated symptoms, duration of illness, medical care seeking, or viral load for some comparisons, although the precision and statistical significance of specific estimates varied.
Authors: Ashley L. Fowlkes, Sc.D., M.P.H., of the Centers for Disease Control and Prevention in Atlanta, is the corresponding author.
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(doi:10.1001/jama.2022.18550)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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