Abstract The VOC of SARS-CoV-2, Omicron (BA. 1, BA. 1.1, BA. 2, or BA. 3), is associated
with an increased risk of reinfection. BA. 2 has become the next dominant variant worldwide …

Worldwide, millions of persons have received multiple COVID-19 vaccinations and
subsequently recovered from SARS-CoV-2 Omicron breakthrough infections. In 2 small …

Background The ongoing outbreak of SARS-CoV-2 Omicron BA. 2 infections in Hong Kong,
the model city of universal masking of the world, has resulted in a major public health crisis …

Abstract The SARS-CoV-2 Omicron variant (B. 1.1. 529) has three major lineages BA. 1, BA.
2, and BA. 3 1. BA. 1 rapidly became dominant and has demonstrated substantial escape …

Abstract The SARS-CoV-2 Omicron variant BA. 2 sublineage is rapidly replacing earlier
Omicron lineages, suggesting BA. 2 has increased vaccine evasion properties. We …

From December 2022 to January 2023, severe acute respiratory syndrome coronavirus 2
(SARS-CoV-2) infections caused by BA. 5 and BF. 7 subvariants of B. 1.1. 529 (Omicron) …

Abstract The SARS-CoV-2 Omicron variant of concern comprises three sublineages
designated BA. 1, BA. 2, and BA. 3, with BA. 2 steadily replacing the globally dominant BA …

Background The ongoing outbreak of SARS-CoV-2 Omicron BA. 2 infections in Hong Kong,
the model city of universal masking of the world, has resulted in a major public health crisis …

Emerging epidemiology data indicate that the Omicron BA. 2 sublineage is expected to
become the dominant strain owing to its enhanced transmissibility. 1 The BA. 1 sublineage …

Abstract The Omicron SARS-CoV-2 has several distinct sublineages, among which
sublineage BA. 1 is responsible for the initial Omicron surge and is now being replaced by …