Abstract:
BACKGROUND AND AIM:As bacterial resistance to clarithromycin limits the efficacy of clarithromycin-based regimens for Helicobacter pylori infection, attention has turned to quinolone-based rescue therapies. Resistance of H. pylori to both clarithromycin and quinolone can be predicted by genetic testing. Here, we used this approach to evaluate the prevalence of clarithromycin- and quinolone-resistant strains of H. pylori in Japan. METHODS:DNA was extracted from gastric tissue samples obtained from 153 patients infected with H. pylori (103 naive for eradication therapy and 50 with previous eradication failure following triple proton pump inhibitor/amoxicillin/clarithromycin therapy). Mutations in H. pylori 23S rRNA and gyrA genes associated with resistance to clarithromycin and quinolones, respectively, were determined. RESULTS:Of 153 patients, 85 (55.6%) were infected with clarithromycin-resistant strains. The prevalence of clarithromycin-resistant strains in patients with previous eradication failure (90.0%, 45/50) was significantly higher than that (38.8%, 40/103) of those naive for eradication therapy (P < 0.001). Fifty-nine patients (38.6%) were infected with strains resistant to quinolones. The incidence of quinolone-resistant strains also appeared higher in patients with eradication failure (48.0%, 24/50) than in those who had not undergone therapy (34.0%, 35/103); however, the difference was not statistically significant (P = 0.112). The incidence of quinolone-resistance in clarithromycin-resistant strains (44/85, 51.8%) was significantly higher than that in clarithromycin-sensitive strains (15/68, 22.1%) (P < 0.001). CONCLUSIONS:A high incidence of quinolone-resistance was found in clarithromycin-resistant strains of H. pylori, particularly in patients with previous eradication failure. Our results suggest that testing for susceptibility of H. pylori to quinolones is useful for determining the optimal rescue eradication regimen.
journal_name
J Gastroenterol Hepatoljournal_title
Journal of gastroenterology and hepatologyauthors
Yamade M,Sugimoto M,Uotani T,Nishino M,Kodaira C,Furuta Tdoi
10.1111/j.1440-1746.2011.06815.xsubject
Has Abstractpub_date
2011-09-01 00:00:00pages
1457-61issue
9eissn
0815-9319issn
1440-1746journal_volume
26pub_type
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journal_title:Journal of gastroenterology and hepatology
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