Bivalent mRNA vaccine effectiveness against COVID-19 infections, hospitalisations and deaths in Portugal: a cohort study based on electronic health records, September 2022 to May 2023

Machado, Ausenda; Kislaya, Irina; Soares, Patrícia; Magalhães, Sarah; Paula Rodrigues, Ana; Franco, Rafael; Pinto Leite, Pedro; Matias Dias, Carlos; Nunes, Baltazar

doi:10.1101/2023.09.05.23295025

Public

Bivalent mRNA vaccine effectiveness against COVID-19 infections, hospitalisations and deaths in Portugal: a cohort study based on electronic health records, September 2022 to May 2023

Published in medRxiv • Sep 5, 2023

Authors:

Ausenda Machado

Irina Kislaya

Patrícia Soares

Abstract

Abstract In Portugal, a bivalent COVID-19 vaccine booster was recommended for those with complete primary COVID-19 vaccination, starting on September 6 2022. This study aims to estimate the mRNA bivalent vaccine effectiveness (VE) against COVID-19 infection, hospitalisation and death in the Portugue...

Subject

Bivalent (engine)

Medicine

Hazard ratio

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