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

Authors
 Yu Jin Park  ;  Nguyen Le Phuong  ;  Naina Adren Pinto  ;  Mi Jeong Kwon  ;  Roshan D’Souza  ;  Jung-Hyun Byun  ;  Heungsup Sung  ;  Dongeun Yong 
Citation
 Antimicrobial Resistance and Infection Control, Vol.7 : 139, 2018 
Journal Title
 Antimicrobial Resistance and Infection Control 
Issue Date
2018
Keywords
Capnophilic ; Escherichia coli ; Misidentification ; Small colony variant
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.
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DOI
10.1186/s13756-018-0438-6
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Laboratory Medicine (진단검사의학교실) > 1. Journal Papers
Yonsei Authors
변정현(Byun, Jung-Hyun)
용동은(Yong, Dong Eun) ORCID logo https://orcid.org/0000-0002-1225-8477
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/166817
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