CD79A and COVID-19: Additional evaluation of kidney transplant patients with positive anti-SARS-CoV-2 antibodies after COVID-19 vaccination (separate analysis of 39 responders) showed that there is no correlation between anti-SARS-CoV-2 titer and patient’s age, level of IgA, M, G, vitamin D concentration, total leucocyte and lymphocyte count, MMF dose, and other routine laboratory test results before and after vaccination.