Among COVID-19 convalescent subjects, a significant correlation between the serum IgG and serum IgA antibody levels was observed in the HIV-1-infected as well as the HIV-1-uninfected subgroup (HIV: r2 = 0.496, p < 0.0001; HU: r2 = 0.304, p = 0.022, Supplementary Figure S2a). This evidence concerns the gene CD79A and COVID-19.