Modification and evaluation of the Triton Hodge test for screening carbapenemase-producing Enterobacteriaceae

Jung Hyun Byun, Jung Lim Gim, Jong Hwa Yum, Dongeun Yong, Kyungwon Lee, Yunsop Chong

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Detection of carbapenemase-producing Enterobacteriaceae (CPE) has become critical for appropriate antimicrobial therapy and for controlling the spread of infection. We evaluated Triton Hodge test (THT) for screening CPE. A spreader can be used to apply more constant volume of Triton on whole surface of Mueller–Hinton agar (MHA), or alternatively, a 10-μL inoculating loop can be used to apply a 20% Triton solution lineally. The THT procedure can be simplified by eliminating the 1/10 dilution step of indicator bacteria from the McFarland 0.5 turbidity suspension. The presence of Triton in the MHA plates significantly increased the enhanced growth size of not only Enterobacteriaceae producing NDM-1–like enzymes but also those producing the most prevalent KPC-2–like enzyme, resulting in 100% sensitivity of the test.

Original languageEnglish
Article number114872
JournalDiagnostic Microbiology and Infectious Disease
Issue number4
Publication statusPublished - 2019 Dec

Bibliographical note

Funding Information:
We are grateful to Myunsook Kim and Yonghee Seo, Clinical Microbiology, Severance Hospital and Research Institute of Bacterial Resistance, for their technical assistance.

Publisher Copyright:
© 2019 Elsevier Inc.

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)
  • Infectious Diseases


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