For example, the prevalence of IgA- and IgG-antibodies to Helicobacter pylori-associated lpp20 antibodies was significantly higher in Helicobacter pylori-infected chronic urticaria compared to the control group of patients with severe H. pylori-associated gastritis without urticaria (93.9 vs. 21.2%, P < 0.0001 for IgG, and 46.1 vs. 6.3%, P < 0.0029 for IgA) [75]. The gene discussed is CD79A; the disease is gastritis.