CD79A and COVID-19: The concentration of total IgG was statistically higher than that of IgA in all BAL samples from COVID-19 patients (early COVID-19 sample mean 82 ± 22 μg/ml for IgG vs 27 ± 8.1 μg/ml for IgA, p < 0.0001, late COVID-19 sample mean: 27 ± 8.1 μg/ml for IgG vs 9 ± 3.8 μg/ml for IgA, p = 0.01).