The gastrointestinal tract is involved in coronavirus disease 2019 (COVID-19) caused by
severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The gut microbiota has …

Real-world data on the effectiveness of COVID-19 vaccines against the Omicron variant (B.
1.1. 529) is limited. This systematic review aimed to investigate the real-world effectiveness …

Abstract The SARS-CoV-2 Omicron variant has demonstrated enhanced transmissibility and
escape of vaccine-derived immunity. Although first-generation vaccines remain effective …

Summary Background In early March 2022, a major outbreak of the severe acute respiratory
syndrome coronavirus 2 (SARS-CoV-2) Omicron variant spread rapidly throughout …

Vaccine effectiveness is lower and wanes faster against infection and symptomatic disease
caused by the omicron variant of SARS-CoV-2 than was observed with previous variants …

Although severe COVID-19 in children is rare, they may develop multisystem inflammatory
syndrome, long-COVID and downstream effects of COVID-19, including social isolation and …

Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome
coronavirus-2 (SARS-CoV-2), is a threat to the health of the global population. As the result …

Background Although paediatric clinical presentations of COVID-19 are usually less severe
than in adults, serious illness and death have occurred. Many countries started the …

Abstract Background The SARS-CoV-2 Omicron BA. 2 subvariant replaced BA. 1 globally in
early 2022, and caused an unprecedented tsunami of cases in Hong Kong, resulting in the …

Objective To estimate the effectiveness of a two dose vaccine schedule (mRNA-1273,
BNT162b2, and BBIBP-CorV) against SARS-CoV-2 infection and covid-19 related death and …