Journal Article

<i>Helicobacter pylori</i> antibiotic resistance patterns and genotypes in adult dyspeptic patients from a regional population in North Wales

Nicola C. Elviss, Robert J. Owen, Jacqueline Xerry, A. Mark Walker and Kenneth Davies

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 54, issue 2, pages 435-440
Published in print August 2004 | ISSN: 0305-7453
Published online August 2004 | e-ISSN: 1460-2091 | DOI:
Helicobacter pylori antibiotic resistance patterns and genotypes in adult dyspeptic patients from a regional population in North Wales

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  • Medical Oncology
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Objective: Surveillance data on Helicobacter pylori antibiotic susceptibilities in Wales are limited, despite resistance being a key factor in treatment failure. A single-centre survey was undertaken over 3 years to determine local antibiotic resistance rates on isolates from dyspeptic patients in Bangor, Gwynedd (North Wales).

Methods: Susceptibilities were determined for 363 isolates by disc diffusion and the Etest. Isolates were also genotyped (cagA presence and vacA allelic types).

Results: Overall in vitro resistance rates were 24% for metronidazole and 7% for clarithromycin, with 4% resistant to both antibiotics. Resistant strains typically had high MICs of >256 mg/L. Tetracycline resistance was identified in only one isolate whereas no isolates showed resistance to amoxicillin. There was a two-fold increase in resistance over the study period. No gender and age associations with resistance were detected. Resistant and susceptible isolates were genotypically diverse with respect to cagA/vacA type but the vacA s1m2 form was a feature of all clarithromycin-resistant isolates compared with 56% of the susceptible isolates.

Conclusion: Although the overall antibiotic resistance rates of H. pylori from North Wales were low compared with many other regions in Europe, continued surveillance, particularly of high-level resistance (MIC >256 mg/L), is recommended to monitor the effects of the ‘test and treat’ strategy for H. pylori eradication.

Keywords: clarithromycin; metronidazole; dual resistance; surveillance

Journal Article.  4039 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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