Establishment of a reference panel of Helicobacter pylori strains for antimicrobial susceptibility testing

Kenji Yokota, Takako Osaki, Shunji Hayashi, Shin ichi Yokota, Hiroaki Takeuchi, Emiko Rimbara, Hinako Ojima, Toyotaka Sato, Hideo Yonezawa, Keigo Shibayama, Kengo Tokunaga, Shigeru Kamiya, Kazunari Murakami, Mototsugu Kato, Toshiro Sugiyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Background: Eradication treatment for Helicobacter pylori gastritis is covered by national health insurance since 2013 in Japan. However, eradication failure due to the increase of antimicrobial resistance has become a serious problem. The present study aims to establish a reference panel of Japanese H. pylori strains for antimicrobial susceptibility testing. Method: A total of 28 strains were collected from 4 medical facilities in Japan. Antimicrobial susceptibility tests (ASTs) to clarithromycin (CLR), amoxicillin (AMX), and metronidazole (MNZ), were used to select standard reference strains. Complete genome sequences were also determined. Results: Three H. pylori strains (JSHR3, JSHR6 and JSHR31) were selected as standard reference strains by the Japanese Society for Helicobacter Research (JSHR). The minimum inhibitory concentrations (MICs) of the antibiotics against these 3 strains by agar dilution method with Brucella-based horse-serum-containing agar medium were as follows: JSHR3 (CLR 16 μg/ml, AMX 0.032 μg/ml and MNZ 4 μg/ml), JSHR6 (CLR 0.016 μg/ml, AMX 0.032 μg/ml and MNZ 4 μg/ml), and JSHR31 (CLR 16 μg/ml, AMX 1 μg/ml and MNZ 64 μg/ml). Conclusions: A reference panel of H. pylori JSHR strains was established. The panel consisted of JSHR6, which was antibiotic-susceptible, JSHR3, which was CLR-resistant, and JSHR31, which was multi-resistant. This reference panel will be essential for standardized ASTs before the optimal drugs are selected for eradication treatment.

Original languageEnglish
Article numbere12874
Issue number3
Publication statusPublished - Jun 2022


  • antibiotic resistance
  • antimicrobial susceptibility tests
  • genome information
  • Helicobacter pylori
  • reference panel

ASJC Scopus subject areas

  • Gastroenterology
  • Infectious Diseases


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