Seric IgG anti-SARS-CoV-2 pre- and post- Covid-19 pandemic from Mexican asymptomatic subjects.

Objective: To detect serum IgG anti-SARS-CoV-2 in pre-and post- Covid-19 pandemic in Mexican asymptomatic subjects in order to know the degree of viral dispersion.

Materials And Methods: Association of serum IgG antibodies (determined by ELISA) to sociodemographic and clinical data or contact with Covid-19 cases in three groups of subjects: 1) Covid-19 pre-pandemic blood donors (n= 538); 2) Covid-19 post-pandemic blood donors (n= 243); 3) Covid-19 post-pandemic neurological patients (n= 312). None of the subjects studied had been vaccinated.