TY - JOUR
T1 - Institutional spread of clonally related Serratia marcescens isolates with a novel AmpC cephalosporinase (S4)
T2 - a 4-year experience in Taiwan
AU - Yu, Wen Liang
AU - Ko, Wen Chien
AU - Cheng, Kuo-Chen
AU - Chen, Hui En
AU - Lee, Ching Chien
AU - Chuang, Yin Ching
N1 - Funding Information:
This work was supported in part by grants CMFHR9305 from Chi-Mei Medical Center and NSC 95-2314-B384-016 from the National Science Council, Taiwan.
PY - 2008/8
Y1 - 2008/8
N2 - Resistance of Serratia marcescens, a nosocomial pathogen of Enterobacteriaceae, to the extended-spectrum β-lactams is usually mediated by an overproduced AmpC cephalosporinase. We aimed to characterize the molecular epidemiology and AmpC of S. marcescens isolates recovered from 1 medical center in southern Taiwan. AmpC-encoding genes for SRT families were investigated by polymerase chain reaction and DNA sequencing. From August 1999 through July 2003, 69 nonrepetitive bloodstream isolates were enrolled. Excluding 11 isolates, which also produced an extended-spectrum β-lactamase, 58 isolates carried an AmpC-encoding gene, including a novel S4 gene with 98% identity to SRT-1 gene (n = 50), SRT-2 gene (n = 3), SST-1 gene (n = 1), and others (n = 4). Isolates with S4 exhibited a phenotype of resistance to cefotaxime (CTX) but not ceftazidime. Genotype analysis by pulsed-field gel electrophoresis revealed that 45 (90%) of the isolates carrying S4 gene belonged to 2 major epidemic clones, including types A (n = 28) and B (n = 17). In conclusion, the AmpC-like S4 β-lactamase may confer CTX resistance of the S. marcescens population. Strains carrying the S4 gene with prolonged dissemination were closely related.
AB - Resistance of Serratia marcescens, a nosocomial pathogen of Enterobacteriaceae, to the extended-spectrum β-lactams is usually mediated by an overproduced AmpC cephalosporinase. We aimed to characterize the molecular epidemiology and AmpC of S. marcescens isolates recovered from 1 medical center in southern Taiwan. AmpC-encoding genes for SRT families were investigated by polymerase chain reaction and DNA sequencing. From August 1999 through July 2003, 69 nonrepetitive bloodstream isolates were enrolled. Excluding 11 isolates, which also produced an extended-spectrum β-lactamase, 58 isolates carried an AmpC-encoding gene, including a novel S4 gene with 98% identity to SRT-1 gene (n = 50), SRT-2 gene (n = 3), SST-1 gene (n = 1), and others (n = 4). Isolates with S4 exhibited a phenotype of resistance to cefotaxime (CTX) but not ceftazidime. Genotype analysis by pulsed-field gel electrophoresis revealed that 45 (90%) of the isolates carrying S4 gene belonged to 2 major epidemic clones, including types A (n = 28) and B (n = 17). In conclusion, the AmpC-like S4 β-lactamase may confer CTX resistance of the S. marcescens population. Strains carrying the S4 gene with prolonged dissemination were closely related.
KW - AmpC
KW - Epidemiology
KW - SRT family
KW - Serratia marcescens
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U2 - 10.1016/j.diagmicrobio.2008.03.010
DO - 10.1016/j.diagmicrobio.2008.03.010
M3 - Article
C2 - 18455901
AN - SCOPUS:47049122736
SN - 0732-8893
VL - 61
SP - 460
EP - 467
JO - Diagnostic Microbiology and Infectious Disease
JF - Diagnostic Microbiology and Infectious Disease
IS - 4
ER -
