CD79A and IgA glomerulonephritis: A clear-cut role has been proposed for Staphylococcus aureus in IgA nephropathy, since Staphylococcus aureus antibodies directed against IgA were increased [46], a Staphylococcus aureus envelope antigen was present in glomeruli of a majority of patients [47], and immunization of Balb/c mice with Staphylococcus aureus antigens led to a phenotype resembling IgA nephropathy [58].