Outbreak of multi-resistant Klebsiella oxytoca involving strains with extended-spectrum β-lactamases and strains with extended-spectrum activity of the chromosomal β-lactamase

被引:53
作者
Decré, D
Burghoffer, B
Gautier, V
Petit, JC
Arlet, G
机构
[1] Univ Paris 06, UPRES No EA2392, Fac Med, UFR St Antoine, F-75012 Paris 12, France
[2] Hop St Antoine, Bacteriol Lab, F-75012 Paris 12, France
[3] Assisatnce Publ Hop Paris, Bacteriol Lab, Hop Tenon, Paris, France
关键词
OXY-2; beta-lactamase; TEM-7; TEM-129;
D O I
10.1093/jac/dkh440
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
Objectives: This study was conducted to analyse broad-spectrum cephalosporin-resistant Klebsiella oxytoca strains. Methods: The 57 isolates studied were recovered from clinical specimens (n=23) or from rectal swabs (n=34) during a 26-month period. Antibiotic susceptibility patterns were determined using standard agar diffusion and dilution methods including the synergy test between extended-spectrum cephalosporins and clavulanic acid. ERIC-2 PCR and pulsed-field gel electrophoresis (PFGE) methods were used to study the clonal relatedness of the strains. Plasmid-mediated and chromosomal beta-lactamases were characterized by mating and specific bla gene amplification and sequencing. Results: Four different antibiotic resistance patterns were identified whereas ERIC-2 PCR and PFGE revealed six main profiles. Extended-spectrum beta-lactamases (ESBLs) were found in 32 strains: TEM-7 (n=26), TEM-129 (n=1), TEM-3 (n=4), SHV-2 (n=1). The new TEM-type beta-lactamase, TEM-129, differed from TEM-7 by one mutation (Glu-104-->Lys). All TEM-7 or TEM-129 producers were genetically related. Twenty-five other strains with identical ERIC-2 PCR and PFGE profiles harboured a bla(OXY-2) gene different from the reference gene: 24 strains displayed one substitution (Ala-237-->Ser) in the KTG motif and one strain, highly resistant to ceftazidime, showed an additional substitution (Pro-167-->Ser). Conclusions: The study demonstrated that the majority of strains (n=52) harbouring the OXY-2-type beta-lactamase corresponded to two clones. The first clone (n=27) corresponded to ESBL-producing strains. The second clone (n=25) displayed extended-spectrum activity of the chromosomal beta-lactamase.
引用
收藏
页码:881 / 888
页数:8
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