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Coronavirus disease‐2019 (COVID‐19) bivalent ancestral/Omicron messenger RNA (mRNA) booster vaccinations became available to boost and expand the immunity against severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) Omicron infections. In a prospective cohort study including 59 healthcare workers, we assessed SARS‐CoV‐2 ancestral and Omicron BA.5‐specific neutralizing antibody and T‐cell responses...
This study (1) determined the association of time since initial vaccine regimen, booster dose receipt, and COVID‐19 history with antibody titer, as well as change in titer levels over a defined period, and (2) determined risk of COVID‐19 associated with low titer levels. This observational study used data from staff participating in the National Football League COVID‐19 Monitoring Program. A cohort...
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