"During May–November 2021, case and hospitalization rates were highest among persons who were unvaccinated without a previous diagnosis. Before Delta became the predominant variant in June, case rates were higher among persons who survived a previous infection than persons who were vaccinated alone. By early October, persons who survived a previous infection had lower case rates than persons who were vaccinated alone." - COVID-19 Cases and Hospitalizations by COVID-19 Vaccination Status and Previous COVID-19 Diagnosis — California and New York, May–November 2021
Additional Authors: Bryon Backenson, Mary T. Bassett, Hannah Henry, Brooke Bregman, Claire M. Midgley, Jennifer F. Myers, Ian D. Plumb, Heather E. Reese, Rui Zhao, Melissa Briggs-Hagen, Dina Hoefer, James P. Watt, Benjamin J. Silk, Seema Jain, Eli S. Rosenberg
Evidence
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