Urinary tract infection caused by a small colony variant form of capnophilic Escherichia coli leading to misidentification and non-reactions in antimicrobial susceptibility tests

Yu Jin Park, Nguyen Le Phuong, Naina Adren Pinto, Mi Jeong Kwon, Roshan D'Souza, Jung Hyun Byun, Heungsup Sung, Dongeun Yong

Research output: Contribution to journalArticle

Abstract

Background: Small colony and capnophilic variant cases have been separately reported, but there has been no reports of their simultaneous presence in one isolate. We report a case of Escherichia coli with coexpressed small colony and capnophilic phenotypes causing misidentification in automated biochemical kits and non-reactions in antimicrobial susceptibility test cards. Case presentation: An 86-year-old woman developed urinary tract infection from a strain of Escherichia coli with SCV and capnophilic phenotypes in co-existence. This strain did not grow without the presence of CO2, and therefore proper identification from automated system was not possible. 16 s rRNA sequencing and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry was able to identify the bacteria. Conclusion: As these strains do not grow on culture parameters defined by CLSI or on automated systems, proper identification using alternative methods are necessary.

Original languageEnglish
Article number139
JournalAntimicrobial Resistance and Infection Control
Volume7
Issue number1
DOIs
Publication statusPublished - 2018 Nov 20

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health
  • Microbiology (medical)
  • Infectious Diseases
  • Pharmacology (medical)

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