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Protection against SARS-CoV-2 infection and COVID-19 hospitalization for each vaccine product during the pre- and post-Delta variant periods adjusted by Cox regression for age, immunosuppression, gender, race, number of visits, and Charlson comorbidity index. Abbreviations: CI, confidence interval; COVID-19, coronavirus disease 2019; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
