A positive correlation was found between the detection of anti-SARS-CoV-2 IgA and IgG among all HCWs and COVID-19 patients (r = +0.7438; p < 0.0001), only in HCWs (r = +0.7137; p < 0.0001) and only in COVID-19 patients (r = +0.8345; p < 0.0001). This evidence concerns the gene CD79A and COVID-19.