Metallo-beta-lactamase detection: Comparative evaluation of double-disk synergy versus combined disk tests for IMP-, GIM-, SIM-, SPM-, or VIM-producing isolates

Metallo-beta-lactamase detection: Comparative evaluation of double-disk synergy versus combined disk tests for IMP-, GIM-, SIM-, SPM-, or VIM-producing isolates

Autor Picao, Renata C. Autor UNIFESP Google Scholar
Andrade, Soraya S. Autor UNIFESP Google Scholar
Nicoletti, Adriana Gianinni Autor UNIFESP Google Scholar
Campana, Eloiza H. Autor UNIFESP Google Scholar
Moraes, Gabriela C. Autor UNIFESP Google Scholar
Mendes, Rodrigo E. Autor UNIFESP Google Scholar
Gales, Ana C. Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo The emergence of metallo-beta-lactamase (MBL)-producing isolates is a challenge to routine microbiology laboratories, since there are no standardized methods for detecting such isolates. the aim of this study was to evaluate the accuracy of different phenotypic methods to detect MBL production among Pseudomonas spp., Acinetobacter spp., and enterobacterial isolates, including GIM, IMP, SIM, SPM, and VIM variants. A total of 46 genetically unrelated Pseudomonas aeruginosa, Pseudomonas putida, Acinetobacter sp., and enterobacterial strains producing distinct MBLs were tested. Nineteen strains were included as negative controls. the inhibition of bacterial growth and beta-lactam hydrolysis caused by MBL inhibitors (IMBL) also were evaluated. the isolates were tested for MBL production by both a double-disk synergy test (DDST) and a combined disk assay (CD) using imipenem and ceftazidime as substrates in combination with distinct IMBL. One hundred percent sensitivity and specificity were achieved by DDST using 2-mercaptopropionic acid in combination with ceftazidime and imipenem for the detection of MBL production among P. aeruginosa and Acinetobacter species isolates, respectively. the CD test showed the same results for detecting MBL-producing enterobacteria by combining imipenem and EDTA, with a 5.0-mm-breakpoint increase in the size of the inhibition zone. Our results indicate that both phenotypic methods to detect MBL-producing isolates should be based on the genera to be tested, regardless of the enzyme produced by such isolates, as well as on the local prevalence of MBL producers.
Idioma Inglês
Financiador Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Brasilia, Brazil
Número do financiamento FAPESP: 2006/07197-0
CNPq: 307714/2006- 3
Data 2008-06-01
Publicado em Journal of Clinical Microbiology. Washington: Amer Soc Microbiology, v. 46, n. 6, p. 2028-2037, 2008.
ISSN 0095-1137 (Sherpa/Romeo, fator de impacto)
Editor Amer Soc Microbiology
Extensão 2028-2037
Fonte http://dx.doi.org/10.1128/JCM.00818-07
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000258695500023
URI http://repositorio.unifesp.br/handle/11600/30677

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