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 …

The rapid rollout of vaccines to combat the coronavirus disease 2019 (COVID-19) pandemic
over the past 2 years has resulted in the use of various vaccine platforms and regional …

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 …

Objective This study aimed to determine the efficacy, effectiveness, and cost-effectiveness of
inactivated COVID-19 vaccines (CoronaVac and BBIBP-CorV) in China using existing …

Background Policymakers urgently need evidence to adequately balance the costs and
benefits of mass vaccination against COVID-19 across all age groups, including children …

For SARS-CoV-2 mutants, the effectiveness of the COVID-19 vaccines is still controversial.
In this study, we aimed to investigate the clinical characteristics of Omicron-infected patients …