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Relationship between Eradication of Helicobacter pylori Infection and Clarithromycin Resistance  

Sohn Seung Ghyu (Department of Biological Sciences, Myongji University)
Lee Jong Hwa (Research Center of Gastroenterology, College of Medicine, Dankook University)
Lee Jung Hun (Department of Biological Sciences, Myongji University)
Lee Sang Hee (Department of Biological Sciences, Myongji University)
Publication Information
Korean Journal of Microbiology / v.41, no.3, 2005 , pp. 177-182 More about this Journal
Abstract
H. pylori strains were isolated from antral biopsies taken during upper endoscopy in 114 dyspeptic patients with no previous therapy against H. pylori. Rapid urease test, PCR amplification of SSA and cagA gene for H. pylori detection, and Western blot for CagA expression detection were performed. H. pylori infected patients were treated with omeprazole, clarithromycin (a macrolide), and amoxicillin. At 6 weeks after the discontinuation of therapy, the bacterial eradication rate was determined by endoscopy. The resistance rate to clarithromycin and amoxicillin was $20.2\%$ and $0.0\%$, respectively. The clarithromycin resistance was mainly caused by the A2142G mutation in the 23S rRNA gene of H. pylori. MICs of clarithromycin for the A2142G mutant isolates were significantly higher than MICs for the A2143G mutant isolates. H. pylori eradication was obtained in all patients with clarithromycin-susceptible isolates but not in patients with clarithromycin-resistant isolates (P = 0.0001). These results did not appear to be biased by any differences in CagA expression. The resistance of H. pylori to clarithromycin included in the therapeutic regimens is the most important reason for treatment failure. H. pylori antimicrobial susceptibility testing of the gastric biopsy culture should be performed before choosing the first triple therapy in infected patients and the increase in prevalence of clarithromycin resistance in Korea was problematic.
Keywords
clarithromycin resistance; eradication rate; H. pylori; peptic ulcer; triple therapy;
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