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

Author Picão, Renata Cristina Autor UNIFESP Google Scholar
Andrade, Soraya Sgambatti Autor UNIFESP Google Scholar
Nicoletti, Adriana Gianinni Autor UNIFESP Google Scholar
Campana, Eloiza Helena Autor UNIFESP Google Scholar
Morais, Gabriela Cezarino de Autor UNIFESP Google Scholar
Mendes, Rodrigo Elisandro Autor UNIFESP Google Scholar
Gales, Ana Cristina Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract 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.
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 2006/07197-0
CNPq: 307714/2006- 3
Date 2008-06-01
Published in Journal of Clinical Microbiology. Washington: Amer Soc Microbiology, v. 46, n. 6, p. 2028-2037, 2008.
ISSN 0095-1137 (Sherpa/Romeo, impact factor)
Publisher Amer Soc Microbiology
Extent 2028-2037
Origin https://dx.doi.org/10.1128/JCM.00818-07
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000258695500023
URI https://repositorio.unifesp.br/handle/11600/30677

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