Protection against severe COVID-19 after second booster dose of adapted bivalent (original/Omicron BA.4-5) mRNA vaccine in persons ≥ 60 years, by time since infection, Italy, 12 September to 11 December 2022 Fabiani, Massimo and Mateo-Urdiales, Alberto and Sacco, Chiara and Fotakis, Emmanouil Alexandros and Rota, Maria Cristina and Petrone, Daniele and Bressi, Marco and Del Manso, Martina and Siddu, Andrea and Fedele, Giorgio and Stefanelli, Paola and Bella, Antonino and Riccardo, Flavia and Palamara, Anna Teresa and Rezza, Giovanni and Brusaferro, Silvio and Pezzotti, Patrizio and on behalf of the Italian Integrated Surveillance of COVID-19 study group and of the Italian COVID-19 Vaccines Registry group, Eurosurveillance, 28, 2300105 (2023), https://doi.org/10.2807/1560-7917.ES.2023.28.8.2300105