Investigation of relationship between serotype/biotype of <i>Yersinia enterocolitica</i> and colony morphology on selective agar

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  • OHNO Tomoko
    Department of Infection Control and Prevention, Aichi Medical University Hospital
  • SUEMATSU Hiroyuki
    Department of Infection Control and Prevention, Aichi Medical University Hospital
  • SAKANASHI Daisuke
    Department of Infection Control and Prevention, Aichi Medical University Hospital
  • YAMADA Atsuko
    Department of Infection Control and Prevention, Aichi Medical University Hospital
  • KAWAMOTO Yuzuka
    Department of Infection Control and Prevention, Aichi Medical University Hospital
  • MIYAZAKI Narimi
    Department of Infection Control and Prevention, Aichi Medical University Hospital
  • YAMAGISHI Yuka
    Department of Clinical Infectious Diseases, Aichi Medical University Department of Clinical Infectious Diseases, Kochi Medical School, Kochi University
  • MIKAMO Hiroshige
    Department of Infection Control and Prevention, Aichi Medical University Hospital Department of Clinical Infectious Diseases, Aichi Medical University

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Other Title
  • <i>Yersinia enterocolitica</i>の血清型・生物型と選択分離培地における発育コロニー性状の関係
  • Yersinia enterocoliticaの血清型・生物型と選択分離培地における発育コロニー性状の関係
  • Yersinia enterocolitica ノ ケッセイガタ ・ セイブツガタ ト センタク ブンリバイチ ニ オケル ハツイク コロニー セイジョウ ノ カンケイ

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Abstract

<p>Yersinia enterocolitica is a non-lactose-fermenting bacterium that forms colorless transparent colonies on Salmonella–Shigella (SS) agar. In 2016, lactose-fermenting Y. enterocolitica obtained from the stools of a patient with ileocecal inflammation and isolated on SS agar was confirmed by mass spectrometry. On the basis of the findings of a previous study, the bacterial species of small colonies that ferment lactose on SS agar were identified by fecal culture tests of patients presenting with clinical symptoms; as a result, five strains of Y. enterocolitica were detected. Five strains that fermented lactose on SS agar were identified as serotype O3, biotype 3, and Voges-Proskauer (VP)-reaction-negative, including three strains that were sucrose-fermenting-positive and two strains that were sucrose-fermenting-negative. VP-reaction-negative strains are difficult to extract and they form lactose-fermenting colonies on SS agar. Yersinia-selective medium should be added in routine methods when finding VP-reaction-negative strain.</p>

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