Molecular Confirmation of an Indole-Negative Klebsiella oxytoca Isolated from a Patient with Cystitis

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  • Takano Youta
    Department of Clinical Laboratory, Nagano Chuo Hospital, Japan
  • Shibano Makiko
    Department of Clinical Laboratory, Nagano Chuo Hospital, Japan
  • Takizawa Yuuya
    Department of Clinical Laboratory, Nagano Chuo Hospital, Japan
  • Arai Eriko
    Department of Laboratory Medicine, Shinshu University Hospital, Japan
  • Koyama Shinobu
    MIROKU Medical Laboratory Inc., Japan
  • Shimizu Takahiro
    Department of Clinical Laboratory, Nagano Municipal Hospital, Japan
  • Matsumoto Takehisa
    Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Japan

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  • Molecular Confirmation of an Indole-Negative <i>Klebsiella oxytoca</i> Isolated from a Patient with Cystitis

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<p>Klebsiella oxytoca is an opportunistic pathogen that causes nosocomial infections. Here, we describe an unusual clinical strain of indole-negative K. oxytoca, GU175, isolated from the urine of a patient with cystitis. The GU175 strain was identified as K. pneumoniae with a probability of 99.40%, negative for indole production, and resistant to third-generation cephalosporins by using the MicroScan Walkaway 40 SI system with the Negative combo EN1 J panel. Biochemical characterization of this strain using lysine-indole motility medium was negative for indole production. However, identification tests using the MALDI Biotyper system and 16S rRNA gene sequence analysis revealed that GU175 is K. oxytoca. DNA sequence analysis of the tryptophanase operon comparing the GU175 strain with the revertant GU176 strain, which tested positive for indole, revealed a point mutation in the Shine-Dalgarno sequence upstream of tnaC in the GU175 strain. This is the first report of indole-negative K. oxytoca, which was attributed to a mutation in the DNA sequence of the tryptophanase operon isolated from a patient with a urinary tract infection. As indole-negative K. oxytoca can be misidentified as K. pneumoniae by biochemical characterization, clinical microbiologists should be aware of such misidentifications.</p>

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