Interestingly, apart from IgA+ plasma cells no significant differences were shown in the mean semi-quantitative score of leukocytes between groups of kidneys with different bacteriological and E. coli IHC results, including the sterile IHC negative group, which indicate similarity in pathogenesis no matter the observed bacteriological results and support that a bacteriological infection have been present at one point in all the investigated kidneys. Here, CD79A is linked to infection.