The DiversiLab system versus pulsed-field gel electrophoresis: characterisation of extended spectrum ß-lactamase producing Escherichia coli and Klebsiella pneumoniae.
J Microbiol Methods
; 83(2): 224-30, 2010 Nov.
Article
en En
| MEDLINE
| ID: mdl-20849889
Fast and reliable epidemiological typing methods for identifying outbreaks and epidemic strains of extended spectrum ß-lactamase (ESBL) producing Enterobacteriaceae are urgently needed. The DiversiLab system (DL) has been proposed for these purposes. We compared DL to pulsed-field gel electrophoresis (PFGE) on a national collection of ESBL-producing Escherichia coli (n=258; of which 226 isolates were typeable with PFGE) and Klebsiella pneumoniae (n=48) isolated in 2007. For E. coli the Wallace coefficients showed that the probability of two isolates of the same DL type having the same PFGE type was only 19.8% and the probability of two isolates of the same PFGE type having the same DL type was 90.4%. For K. pneumoniae the Wallace coefficients showed that the probability of two isolates of the same DL type having the same PFGE type was 100% and the probability of two isolates of the same PFGE type having the same DL type was 79%, indicating that for this K. pneumoniae strain collection DL was slightly more discriminatory. Only four of 48 isolates had discordant results with the two methods. In E. coli 42% of the isolates were sequence type 131 and these isolates were related at >95% similarity with DL and at ≥60% similarity with PFGE. In summary, for E. coli DL performed well in identifying isolates related by PFGE, but overestimated the genetic relatedness in the studied collection. This indicates that DL could be a primary screening method for excluding unrelated isolates. Isolates shown to be related must be confirmed with a more discriminatory method. For K. pneumoniae, DL discriminated well but overestimated the diversity of the isolates compared to PFGE, assuming a risk of missing possible genetic relatedness.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Beta-Lactamasas
/
Reacción en Cadena de la Polimerasa
/
Dermatoglifia del ADN
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Técnicas de Tipificación Bacteriana
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Electroforesis en Gel de Campo Pulsado
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Escherichia coli
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Klebsiella pneumoniae
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
Límite:
Humans
Idioma:
En
Revista:
J Microbiol Methods
Año:
2010
Tipo del documento:
Article
País de afiliación:
Suecia
Pais de publicación:
Países Bajos