Subject: The patient of gastritis, gastric ulcer, and duodenal ulcer infected with Helicobacter pylori~170 subjects per group~Eradication regimens are as follows: AOC group, treated with amoxicillin, rabeprazole, clarithromycin for 7 days; AOM group, treated with amoxicillin, rabeprazole, metronidazole for 7 days; sequential group, treated with amoxicillin, rabeprazole for 5 day, followed by clarithromycin, metronidazole, rabeprazole for 5 days; concomitant group, treated with amoxicillin, clarithromycin, metronidazole, rabeprazole for 7 days
If we compare eradication rate of Helicobacter pylori divided to 4 groups: amoxicillin, rabeprazole, clarithromycin(AOC), amoxicillin, rabeprazole, metronidazole(AOM), treated with amoxicillin, rabeprazole for 5 day, followed by clarithromycin, metronidazole, rabeprazole for 5 days(sequential), amoxicillin, clarithromycin, metronidazole, rabeprazole(concomitant), then the eradication rate of concomitant group will be the highest.