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. 2022 Jul 27;13:920227. doi: 10.3389/fimmu.2022.920227

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Copyright © 2022 Aiello, Grossi, Meschi, Meledandri, Vanini, Petrone, Casetti, Cuzzi, Salmi, Altera, Pierelli, Gualano, Ascoli Bartoli, Castilletti, Agrati, Girardi, Palmieri, Nicastri, Di Rosa and Goletti

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Flow chart of the enrolled household contacts of COVID-19 cases. Household contacts of COVID-19 cases (n=42) were enrolled and analyzed at the execution of the first nasopharyngeal swab (T0) and after 7-20 days (T1), at the end of the quarantine period. Twenty-eight of these subjects returned to follow-up. Footnote: COVID-19, COronaVIrus Disease 2019.