Detection of Amp C beta lactamases production in Escherichia coli & Klebsiella by an inhibitor based method.
Artigo
em Inglês
| IMSEAR
| ID: sea-24957
ABSTRACT
BACKGROUND & OBJECTIVE:
Detection of AmpC-mediated resistance in Gram-negative organisms poses a problem due to misleading results in phenotypic tests. There are no recommended guidelines for detection of this resistance mechanism and there is a need to address this issue as much as the detection of extended spectrum beta lactamases (ESBLs) since both may co-exist and mask each other. Though resistance to cefoxitin is used as a screening test, it does not reliably indicate Amp C production. This study was undertaken to detect Amp C beta lactamases in certain Gram-negative bacteria employing an inhibitor base test using boronic acid.METHODS:
A total number of 76 consecutive non repetitive clinical isolates of Escherichia coli (n=67) and 9 Klebsiella pneumoniae (n=9) obtained over a period of two months, were screened for amp C production by disc diffusion method using cefoxitin (30 microg) dics and confirmed by inhibitor based test using boronic acid as inhibitor.RESULTS:
A total of 36 of 76 isolates (47.3%) screened harboured amp C enzymes, of which a majority 31 (86.1%) co-produced ESBL enzymes. Pure ampC production was seen in 7 (9.2%) of isolates only. INTERPRETATION &CONCLUSION:
Most of the amp C producers also produced ESBL enzymes. The inhibitor based test was useful in identifying cefoxitin susceptible amp C producers and could also effectively differenciate ESBL from amp C producing isolates.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Especificidade da Espécie
/
Proteínas de Bactérias
/
Beta-Lactamases
/
Ácidos Borônicos
/
Cefoxitina
/
Farmacorresistência Bacteriana
/
Escherichia coli
/
Testes de Sensibilidade a Antimicrobianos por Disco-Difusão
/
Klebsiella
Tipo de estudo:
Estudo diagnóstico
/
Guia de Prática Clínica
Idioma:
Inglês
Ano de publicação:
2007
Tipo de documento:
Artigo
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