The clinical course and outcome of COVID-19 are highly variable, ranging from
asymptomatic infections to severe disease and death. Understanding the risk factors of …

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) human adaptation resulted
in distinct lineages with enhanced transmissibility called variants of concern (VOCs) …

Background Despite a large proportion of the population having been vaccinated and
infected, Singapore had SARS-CoV-2 waves driven by the BA. 5 and XBB sublineages of …

Summary Background Among the Omicron sublineages that have emerged, BA. 1, BA. 2,
BA. 5, and their related sublineages have resulted in the largest number of infections. While …

The vaccines currently form part of the national immunisation programmes in many countries
including Denmark. Both vaccines incorporate a monovalent component designed to target …

Abstract The SARS-CoV-2 Omicron subvariants BA. 1 and BA. 2 exhibit reduced lung cell
infection relative to previously circulating SARS-CoV-2 variants, which may account for their …

Expansion of the SARS-CoV-2 BA. 4 and BA. 5 Omicron subvariants in populations with
prevalent immunity from prior infection and vaccination, and associated burden of severe …

Continuous emergence of the Omicron variant, along with its subvariants, has caused an
increasing number of infections, reinfections, and vaccine-breakthrough infections, seriously …

Summary Background The Omicron era of the COVID-19 pandemic commenced at the
beginning of 2022 and whilst it started with primarily BA. 1, it was latter dominated by BA. 2 …

(A) Incidence of documented SARS-CoV-2 infection overlaid with the period of dominance of
the BA. 1 and BA. 2 variants, Jan 1–Apr 14, 2022, divided into 15-day sub-intervals (shades …