Prevalence of H. pylori, cagA , and EPIYA patterns according to histopathological diagnoses. A) Percentage of patients with H. pylori infection according to gastric disease. There were statistically significant differences in the prevalence of H. pylori among the study groups (p = 0.037, χ2 test). B) Percentage of cagA among patients with H. pylori infection. The prevalence of cagA-positive H. pylori was very similar among the study groups (p = 0.930, χ2 test). C) The prevalence of the different EPIYA patterns in the cagA gene is shown. The EPIYA-ABC and ABCC sequences were differentially distributed among patients with chronic gastritis, peptic ulcers, and gastric cancer (p = 0.000; Fisher’s exact test).