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
Kislaya, Irina and Machado, Ausenda and Magalhães, Sarah and Rodrigues, Ana Paula and Franco, Rafael and Leite, Pedro Pinto and Dias, Carlos Matias and Nunes, Baltazar, Eurosurveillance, 27, 2200697 (2022), https://doi.org/10.2807/1560-7917.ES.2022.27.37.2200697