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Plasmid-mediated, inducible AmpC β-lactamase (DHA-1)-producing Enterobacteriaceae at a Korean hospital: wide dissemination in Klebsiella pneumoniae and Klebsiella oxytoca and emergence in Proteus mirabilis

 Dongeun Yong  ;  Youngsik Lim  ;  Wonkeun Song  ;  Yeoung Seon Choi  ;  Doe-Young Park  ;  Hyukmin Lee  ;  Jong Hwa Yum  ;  Kyungwon Lee  ;  June Myung Kim  ;  Yunsop Chong 
 Diagnostic Microbiology and Infectious Disease, Vol.53(1) : 65-70, 2005 
Journal Title
 Diagnostic Microbiology and Infectious Disease 
Issue Date
DHA-1 ; AmpC β-lactamase ; Proteus mirabilis ; Korea
DHA-1 ; AmpC β-lactamase ; Proteus mirabilis ; Korea
The aim of the study was to investigate the phenotypic and genetic characteristics of recently emerging cefoxitin-resistant and induction-positive isolates of Escherichia coli, Klebsiella species, and Proteus mirabilis. Strains of Enterobacteriaceae were isolated at a Korean tertiary care hospital between June and December 2002. Induction was tested using cefoxitin and aztreonam disks, the blaDHA allele was detected by PCR, and pulsed-field gel electrophoresis (PFGE) patterns were also analyzed. Among the cefoxitin-resistant isolates, 2.7% of E. coli, 21.1% of Klebsiella pneumoniae, 32.0% of Klebsiella oxytoca, and 8.3% of P. mirabilis isolates showed induction, and were blaDHA-1 allele positive. To the best of our knowledge, this is the first report of blaDHA-1 in P. mirabilis. The MICs of ceftazidime, cefotaxime, and aztreonam increased significantly by higher inoculum, suggesting that their clinical usefulness is limited. Presence of multiple PFGE patterns and identical patterns in some isolates suggest that the widely disseminated blaDHA-1 in Klebsiella species was because of both horizontal and clonal spread.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Laboratory Medicine (진단검사의학교실) > 1. Journal Papers
Yonsei Authors
Kim, June Myung(김준명)
Yong, Dong Eun(용동은) ORCID logo https://orcid.org/0000-0002-1225-8477
Lee, Kyungwon(이경원) ORCID logo https://orcid.org/0000-0003-3788-2134
Lee, Hyuk Min(이혁민) ORCID logo https://orcid.org/0000-0002-8523-4126
Chong, Yun Sop(정윤섭)
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