CD79A and Klebsiella pneumonia: For example, Tani et al. [64] reported that Japanese patients with RA have high IgG antibody titers against Proteus mirabilis and Klebsiella pneumonia, while Japanese patients with AS have high IgA antibody titers against Klebsiella pneumonia but not Proteus mirabilis, indicating that a particular strain of bacteria may be involved in different diseases.