Figure 1. Distribution of MIC (minimum inhibitory concentrations) values of isolated H. pylori in response to (A) amoxicillin, (B) clarithromycin, (C) metronidazole, and (D) levofloxacin.
H. pylori was isolated from patients enrolled for first-line therapies (naïve group) and, among rescue groups, patients who had previously received amoxicillin, clarithromycin, metronidazole or levofloxacin only once on anti-H. pylori therapies (antibiotic once recipient group). The breakpoint for resistance to each antibiotic was indicated by the vertical dash line.