a novel reduction strategy of clarithromycin resistance in helicobacter pylori

background antibiotic resistance is a major therapeutic problem in patients infected with helicobacter pylori. h. pylori clarithromycin resistant mutants have been evolved during antibiotic therapy, this is mainly due to 23s rrna point mutations. objectives in the present study, we investigated anti-mutational features of four traditionally iranian medicinal plants on three local isolated h. pylori strains. materials and methods in this study clarithromycin resistance was used as a mutation indicator. frequencies of such mutations in the presence and absence of plant extracts were evaluated. mutation incidence was evaluated by luria delbruck fluctuation assay. results the mean mutation frequency in h. pylori isolates was 27 × 10-9 which decreased at the presence of mirtus communis, teucrium polium, achillea millefolium and thymus vulgaris of plant extract, this amount was 97.4%, 95.2%, 63.7% and 19.6% respectively. moreover, a-to-g transition at 2143 position (a2143g) was detected by pcr-sequencing as major point mutation causing clarithromycin resistant mutants. conclusions the efficacy of these plant extracts in prohibiting resistance showed considerable results. this finding should be considered to use plant extracts with antibiotics to develop more effective eradication regimens.