An estimate of Omicron’s fitness advantage
The persistent evolution of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causal agent of the coronavirus disease 2019 (COVID-19), has prolonged the current pandemic. This has led to the emergence of several SARS-CoV-2 variants, some of which have been classified as variants of concern (VOC) or variants of interest (VOI). These classifications are …