The efficacy of vaccines against coronavirus disease 2019 (COVID-19) has now been well
established in phase III clinical trials. However, clinical studies based on real-world data …

Objectives The rapid spread of the SARS-CoV-2 Omicron variant has raised concerns
regarding waning vaccine-induced immunity and durability. We evaluated protection of the …

This cohort study on the entire population of an Italian Province assessed the incidence of
potentially vaccine-related serious adverse events (PVR-SAEs) by COVID-19 vaccination …

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 …

The surge in coronavirus disease 2019 (COVID-19) caused by the Omicron variants of the
severe acute respiratory syndrome coronavirus 2 necessitates researches to inform vaccine …

Objectives The clinical course of coronavirus disease 2019 (COVID-19) infection is often
aggressive, with unfavorable outcomes for those with comorbidities such as type 2 diabetes …

Background COVID-19 is a respiratory illness caused by SARS-CoV-2. The most recent
variant is Omicron (line B. 1.1. 529), which was first identified in South Africa in November …

We carried out a cohort study on the overall population of the province of Pescara, Italy, to
assess the real-world effectiveness of SARS-CoV-2 vaccination against infection, severe, or …

Real-world evidence on the effectiveness of COVID-19 vaccines marketed in China against
the Omicron BA. 2.2 variant remains scarce. A case–control study was conducted to estimate …

Background: Both natural immunity and vaccine-induced immunity to COVID-19 may be
useful to reduce the mortality/morbidity of this disease, but still a lot of controversy exists …