Risk reduction of severe outcomes in vaccinated COVID-19 cases: an analysis of surveillance data from Estonia, Ireland, Luxembourg and Slovakia, January to November 2021 Marrone, Gaetano and Nicolay, Nathalie and Bundle, Nick and Karki, Tommi and Spiteri, Gianfranco and Suija, Heleene and Kärblane, Kerstin-Gertrud and Mossong, Joël and Vergison, Anne and Avdicova, Maria and Mecochova, Adriana and Cullen, Gillian and O’Lorcain, Piaras and Celentano, Lucia Pastore and Derrough, Tarik and Beauté, Julien, Eurosurveillance, 27, 2200060 (2022), https://doi.org/10.2807/1560-7917.ES.2022.27.7.2200060