COVID-19 vaccine effectiveness among healthcare workers: a hospital-based cohort study.

Vânia GaioAna João SantosPalmira AmaralJoão Faro VianaIsabel AntunesVânia PachecoArtur PaivaPedro Pinto LeiteLígia Antunes GonçalvesLucília AraújoAdriana SilvaCarlos Matias DiasIrina KislayaBaltazar NunesAusenda Machado

Published in: BMJ open (2023)

This cohort study found a high COVID-19 VE against symptomatic SARS-CoV-2 infection in Portuguese HCWs after vaccination with one booster dose, even after Omicron variant occurrence. The small sample size, the high vaccine coverage, the very low number of unvaccinated individuals and the few events observed during the study period contributed to the low precision of the estimates.

Keyphrases

coronavirus disease
sars cov
respiratory syndrome coronavirus
systematic review
randomized controlled trial
risk assessment
healthcare
psychometric properties