@article{69712c78816e4691bcd02d8e19482d02,
title = "COVID-19 mRNA vaccine effectiveness (second and first booster dose) against hospitalisation and death during Omicron BA.5 circulation: cohort study based on electronic health records, Portugal, May to July 2022",
abstract = "We measured vaccine effectiveness (VE) against COVID-19-related severe outcomes in elderly people in Portugal between May and July 2022. In ≥ 80 year-olds, the second booster dose VE was 81% (95% CI: 75–85) and 82% (95% CI: 77–85), respectively, against COVID-19-related hospitalisation and death. The first booster dose VE was 63% (95% CI: 55–70) in≥80 year-olds and 74% (95% CI: 66–80) in 60–79 year-olds against hospitalisation, and 63% (95% CI: 57–69) and 65% (95% CI: 54–74) against death.",
author = "Irina Kislaya and Ausenda Machado and Sarah Magalh{\~a}es and Rodrigues, {Ana Paula} and Rafael Franco and Leite, {Pedro Pinto} and Dias, {Carlos Matias} and Baltazar Nunes",
note = "Funding Information: The authors are grateful to Marta Barreto and Ver{\'o}nica G{\'o}mez from the Department of Epidemiology of Instituto Nacional de Sa{\'u}de Doutor Ricardo Jorge and Camila Cruz and Jo{\~a}o Lima from Shared Services of the Health Ministry for their contributions for this work. Publisher Copyright: {\textcopyright} 2022 European Centre for Disease Prevention and Control (ECDC). All rights reserved.",
year = "2022",
month = sep,
day = "15",
doi = "10.2807/1560-7917.ES.2022.27.37.2200697",
language = "English",
volume = "27",
journal = "Eurosurveillance",
issn = "1025-496X",
publisher = "European Centre for Disease Prevention and Control",
number = "37",
}