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Related Experiment Videos

Helicobacter pylori susceptibility testing by disc diffusion.

Cliodna McNulty1, Robert Owen, David Tompkins

  • 1Public Health Laboratory, Gloucestershire Royal Hospital, Great Western Road, Gloucester GL1 3NN, UK. jwhiting@phls.org.uk

The Journal of Antimicrobial Chemotherapy
|March 23, 2002
PubMed
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Routine susceptibility testing for Helicobacter pylori infections is crucial due to rising antibiotic resistance. This study proposes standardized disc diffusion methods for metronidazole and clarithromycin to guide effective treatment.

Area of Science:

  • Microbiology
  • Clinical Diagnostics
  • Infectious Diseases

Background:

  • Helicobacter pylori infection affects approximately 40% of the population, leading to duodenal disease.
  • Standard triple therapy for H. pylori involves proton-pump inhibitors or bismuth salts plus two antibiotics.
  • Increasing antibiotic resistance compromises the efficacy of current H. pylori eradication treatments.

Purpose of the Study:

  • To establish standardized disc diffusion testing methods for H. pylori susceptibility.
  • To provide guidance for routine susceptibility testing to improve patient treatment and monitor antibiotic resistance.
  • To address the lack of nationally agreed standards for H. pylori disc diffusion assays.

Main Methods:

  • Recommended a standardized disc diffusion method using H. pylori cultures (McFarland Standard no. 4) on Mueller-Hinton or Columbia agar with specific antibiotic disc strengths.

Related Experiment Videos

  • Specified disc strengths: 5 µg for metronidazole and 2 µg for clarithromycin.
  • Indicated that anaerobic pre-incubation is not necessary and recommended using a susceptible H. pylori control strain.

    • Main Results:

    • Defined zone size criteria for metronidazole susceptibility on Mueller-Hinton agar (<16 mm resistant, 16-21 mm intermediate, >21 mm susceptible) and Columbia agar (<10 mm resistant, ≥10 mm susceptible).
    • Suggested re-testing intermediate metronidazole results using Etest.
    • Established zone size interpretations for clarithromycin (no zone resistant, any zone susceptible) on both agar types.

    Conclusions:

    • Standardized disc diffusion methods are essential for accurate H. pylori susceptibility testing.
    • Implementing these guidelines can aid in personalized patient treatment and surveillance of antibiotic resistance.
    • The study addresses co-infection challenges and provides clear interpretations for metronidazole and clarithromycin resistance.