At 3 days after the last infection, ELISA revealed that levels of the IgM and IgG1 in the blood did not differ (Figure 5(a)), while antigen-specific IgA in the gastric tissue were reduced in the anti-CD90.2 antibody-treated mice compared with those in the isotype-treated mice (Figure 5(b)). The gene discussed is CD79A; the disease is infection.