Seroprevalence of SARS-CoV-2 IgG significantly varies with age: results from a mass population screening (SARS-2-SCREEN-CdA).

Castiglione D9Adda is one of the towns earlier and more severely affected by the SARS-CoV-2 epidemic in Lombardy. In a mass screening involving 4174 out of about 4550 total inhabits, significant age-related differences in anti SARS-CoV-2 IgG seroprevalence were found, with the lowest prevalence in the youngest inhabitants.