Introduction COVID-19 vaccines have been highly effective in reducing morbidity and
mortality during the pandemic. However, the emergence of the Omicron variant and …

Background and objective The fourth dose the COVID-19 vaccine was first proposed to
immunocompromised patients. The aim of the article is to systematically review the literature …

Objective: People with HIV were underrepresented in coronavirus disease 2019 (COVID-19)
vaccine clinical trials. We estimated vaccine effectiveness (VE) against severe acute …

OBJECTIVES This study aimed to provide real-world evidence on coronavirus disease 2019
vaccine effectiveness (VE) against symptomatic infection and severe outcomes caused by …

Background Understanding how the efficacy of COVID-19 vaccines translates from clinical
trials to real-world settings is critical to inform evolving vaccination policies. The objective of …

BACKGROUND As of 31 December 2022, there were over 6.6 million coronavirus disease
2019 (COVID-19) deaths and over 651 million cases across 200 countries worldwide …

Background: The effect of a second booster dose of COVID-19 vaccine on the risk of death
from all causes among the oldest and frailest individuals is unknown. We aimed to …

Good practice statement on the use of second booster doses for COVID-19 vaccines Page 1
Good practice statement on the use of second booster doses for COVID-19 vaccines 1 Good …

Die STIKO empfiehlt eine weitere Auffrischimpfung für Personen ab dem Alter von 60 Jahren
sowie für Personen im Alter ab 5 Jahren mit erhöhtem Risiko für schwere COVID-19 …

Una vez transcurrido alrededor de un año y medio (en el momento de escribir estas líneas)
desde el inicio de la campaña masiva de vacunación en la que, gracias a las altas …