Background Synthesising evidence on the long-term vaccine effectiveness of COVID-19
vaccines (BNT162b2 [Pfizer–BioNTech], mRNA-1273 [Moderna], ChAdOx1 nCoV-19 …

Abstract New Coronavirus Disease 2019 (COVID-19) vaccines are available to prevent the
ongoing severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic. We …

Background Different forms of vaccines have been developed to prevent the SARS‐CoV‐2
virus and subsequent COVID‐19 disease. Several are in widespread use globally …

Objective To estimate the coronavirus disease 2019 (COVID-19) vaccine effectiveness (VE)
against concerned outcomes in real-world settings. Methods Studies reporting COVID-19 VE …

The coronavirus disease 2019 (COVID-19) pandemic has threatened global health and
prompted the need for mass vaccination. We aimed to assess the efficacy and effectiveness …

Background Knowing whether COVID-19 vaccine effectiveness wanes is crucial for
informing vaccine policy, such as the need for and timing of booster doses. We aimed to …

Objective To evaluate the effectiveness of heterologous and homologous covid-19 vaccine
regimens with and without boosting in preventing covid-19 related infection, hospital …

Billions of doses of COVID-19 vaccines have been administered globally, dramatically
reducing SARS-CoV-2 incidence and severity in some settings. Many studies suggest …

Background COVID-19 is rapidly spreading causing extensive burdens across the world.
Effective vaccines to prevent COVID-19 are urgently needed. Methods and findings Our …

Background Research suggests the protection offered by COVID-19 vaccines might wane
over time, prompting consideration of booster vaccinations. Data on which vaccines offer the …