Tag: Efficacy

To the Editor: In November 2021, the B.1.1.529 (omicron) variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was detected in South Africa.1 Since then, omicron has rapidly spread around…

Participants Figure 1. Figure 1. Screening, Randomization, and Follow-up. The full analysis population included all participants who underwent randomization and received at least one dose of vaccine or placebo, regardless…