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Prevalência das famílias TEM, SHV e CTX-M de β-lactamases de espectro estendido em Escherichia coli e Klebsiella spp no Hospital Universitário de Santa Maria, Estado do Rio Grande do Sul Prevalence of the TEM, SHV and CTX-M families of extended-spectrum β-lactamases in Escherichia coli and Klebsiella spp at the University Hospital of Santa Maria, State of Rio Grande do Sul

By Caio Fernando de Oliveira, Nara Lucia Frazzon Dal Forno, Izabel Almeida Alves, Jorge André Horta, Alexandre Rieger and Sydney Hartz Alves

Abstract

Neste estudo estimou-se a distribuição e prevalência de &#946;-lactamases de espectro estendido pertencentes às famílias TEM, SHV e CTX-M entre amostras de Escherichia coli e Klebsiella spp. no Hospital Universitário de Santa Maria, Rio Grande do Sul. Durante 14 meses, 90 microrganismos foram selecionados como prováveis produtores de ESBL. Os isolados foram submetidos a testes fenotípicos confirmatórios para a presença de ESBL. A seguir, os tipos de ESBLs presentes em cada microrganismo foram determinados através da pesquisa dos respectivos genes através da reação em cadeia da polimerase. Empregando-se o método do disco combinado, a presença de ESBLs foi confirmada em 55 (61,1%) amostras; quando o método do duplo disco foi utilizado, 57 (63,3%) amostras foramprodutoras de ESBLs. Com base na PCR, as ESBLs do tipo TEM e SHV foram mais presentes em Klebsiella pneumoniae enquanto que ESBL do tipo CTX-M foram mais presentes em Klebsiella oxytoca.<br>In this study, the distribution and prevalence of extended-spectrum &#946;-lactamases belonging to the TEM, SHV and CTX-M families were estimated among samples of Escherichia coli and Klebsiella spp. at the university hospital of Santa Maria, Rio Grande do Sul. Over a 14-month period, 90 microorganisms were selected as likely ESBL producers. The isolates were subjected to confirmatory phenotype tests for the presence of ESBL. Through investigating the respective genes using the polymerase chain reaction, the ESBL types present in each microorganism were then determined. Fifty-five samples (61.1%) were confirmed as ESBL-positive by means of the combined disc method, and 57 (63.3%) were found to be ESBL producers by means of the double disc method. From the polymerase chain reaction, ESBLs of TEM and SHV types were more frequently present in Klebsiella pneumoniae, while ESBL of CTX-M type was more frequently present in Klebsiella oxytoca

Topics: &#946;-lactamases de espectro estendido, Escherichia coli, Klebsiella spp, Reação em cadeia da polimerase, extended-spectrum &#946;-lactamases, Escherichia coli, Klebsiella spp, polymerase chain reaction, Medicine (General), R5-920, Medicine, R, DOAJ:Medicine (General), DOAJ:Health Sciences, Arctic medicine. Tropical medicine, RC955-962
Publisher: Sociedade Brasileira de Medicina Tropical (SBMT)
Year: 2009
DOI identifier: 10.1590/S0037-86822009000500014
OAI identifier: oai:doaj.org/article:81d21cc0d31d419ca2219f1a4e48d05b
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