Fedele, Giorgio, Paola Stefanelli, Antonino Bella, Stefano Fiore, Serena Pancheri, Eleonora Benedetti, Concetta Fabiani, Pasqualina Leone, Paola Vacca, Ilaria Schiavoni, Arianna Neri, Anna Carannante, Maurizio Simmaco, Iolanda Santino, Maria Grazia Zuccali, Giancarlo Bizzarri, Rosa Magnoni, Pier Paolo Benetollo, Silvio Brusaferro, Giovanni Rezza, and Antonio Ferro. “Anti-SARS-CoV-2 Antibodies Persistence After Natural Infection: A Repeated Serosurvey in Northern Italy: COVID-19 IgG Longevity and Neutralization ”. Annali dell’Istituto Superiore di Sanità 57, no. 4 (December 10, 2021): 265-271. Accessed January 23, 2022. https://annali.iss.it/index.php/anna/article/view/1394.