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 2022Irina Kislaya, Baltazar Nunes, Rafael Franco et al.|Eurosurveillance|2022Cited by 24
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 2023Ausenda Machado, Baltazar Nunes, Irina Kislaya et al.|medRxiv|2023Cited by 3