Repeated epidemics caused by extended-spectrum beta-lactamase-producingSerratia marcescens strains

被引:20
|
作者
F. Luzzaro
M. Perilli
R. Migliavacca
G. Lombardi
P. Micheletti
A. Agodi
S. Stefani
G. Amicosante
L. Pagani
机构
[1] Hospital of Varese and University of Pavia,Laboratory of Microbiology
[2] University of L'Aquila,Department of Biomedical Sciences and Technology
[3] University of Pavia,Department of Morphological and Clinical Sciences, Section of Microbiology
[4] University of Catania,Institute of General Biology
[5] University of Catania,Institute of Microbiology
关键词
Intensive Care Unit; Restriction Fragment Length Polymorphism; Restriction Fragment; Fragment Length Polymorphism; Gene Amplification;
D O I
10.1007/BF01708345
中图分类号
学科分类号
摘要
An outbreak ofSerratia marcescens involving 42 patients admitted to the general intensive care unit of the Hospital of Varese, Italy, occurred from March 1994 to August 1995. The causative strains were resistant to oxyimino-cephalosporins and monobactams due to their production of an extended-spectrumβ-lactamase. Another outbreak caused bySerratia marcescens strains had occurred in the same unit a few months earlier, from February to October 1993, with the strains involved producing a novel TEM-derived extended-spectrumβ-lactamase. In order to verify whether there were any relationships between isolates from the two epidemics, the strains and their enzymes were characterized. Biochemical data and gene amplification experiments showed that the isolates of the second outbreak harbored a non-conjugative plasmid of approximately 48 kb, codifying for the production of an SHV-derived extended-spectrumβ-lactamase with pI 8.2. Restriction fragment length polymorphism analysis of total genomic DNA by pulsed-field gel electrophoresis ofSerratia marcescens isolates unambiguously identified two different bacterial clones responsible for the two epidemics. Epidemiological and microbiological investigations demonstrated the long persistence ofSerratia marcescens strains and their circulation in other hospital wards, thus suggesting their possible role as a long-term reservoir for further epidemic spread.
引用
收藏
页码:629 / 636
页数:7
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