Increasing risk of breakthrough COVID-19 in outbreaks with high attack rates in European long-term care facilities, July to October 2021 Suetens, Carl and Kinross, Pete and Gallego Berciano, Pilar and Arroyo Nebreda, Virginia and Hassan, Eline and Calba, Clémentine and Fernandes, Eugenia and Peralta-Santos, Andre and Casaca, Pedro and Shodu, Nathalie and Dequeker, Sara and Kontopidou, Flora and Pappa, Lamprini and Kacelnik, Oliver and Børseth, Anita Wang and O’Connor, Lois and Garvey, Patricia and Liausedienė, Rasa and Valintelienė, Rolanda and Ernst, Corinna and Mossong, Joël and Štefkovičová, Mária and Prostináková, Zuzana and Danielsen, Ann Caroline and Mougkou, Aikaterini and Lamb, Favelle and Cenciarelli, Orlando and Monnet, Dominique L. and Plachouras, Diamantis, Eurosurveillance, 26, 2101070 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.49.2101070