Subjects with blood group O are not at lower risk to acquire SARS‐CoV‐2 infection. Issue 4 (16th December 2020) - Gamal, Nesrine; Villa, Erica; Rolli, Marco; Pecorari, Monica; Mirabella, Giorgia; Bertellini, Elisabetta; Ceccherelli, Giovanni; Venturelli, Donatella