JAC Advance Access published online on September 1, 2003
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkg416
© 2003 by The British Society for Antimicrobial Chemotherapy
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Brief report
1 Laboratório Alerta; Laboratório Especial de
Microbiologia Clínica, Division of Infectious Diseases,
Universidade Federal de São Paulo, Rua Leandro Duprét,
188, São Paulo, SP - 04025-010, Brazil
* Corresponding author. E-mail: galesac{at}aol.com.
Received 3 April 2003
; revised 14 July 2003
; accepted 15 July 2003
Background: In Brazil, carbapenem
use has been limited by high carbapenem-resistance rates among Pseudomonas aeruginosa isolates. Objective: The main objective of this study
was to evaluate the presence of an epidemic P. aeruginosa strain in
unrelated Brazilian hospitals. We also aimed to search for the gene blaSPM, which encodes production of SPM,
a novel metallo- Methods: A reference broth microdilution method
was used for antimicrobial susceptibility testing. The isolates
were typed by ribotyping and pulsed-field gel electrophoresis (PFGE).
A disc-approximation test using MBL inhibitors was employed to screen
isolates for MBL production. PCR was used to search for the gene blaSPM. Results: A total of 43 clinical isolates of
carbapenem-resistant P. aeruginosa were collected
from 12 hospitals. Colistin retained greatest activity in
vitro. A single ribogroup included 17 P. aeruginosa isolates (39.5%)
collected from seven unrelated hospitals located in five Brazilian
states. Sixteen of these isolates showed an identical PFGE pattern,
and 15 produced an SPM-1-like MBL. The remaining 26 isolates were grouped
into 25 diverse ribogroups; none were MBL producers. Conclusions: The emergence and dissemination
of an epidemic clone has contributed to the high carbapenem resistance
rates among P. aeruginosa isolates in Brazil. In
addition, the production of SPM MBL has an important role in carbapenem
resistance in this region. This is the first report of dissemination
of an SPM-1-like-MBL-producing strain of P. aeruginosa among
unrelated Brazilian hospitals.
Keywords: Gram-negative bacilli, carbapenem resistance,
Brazil
Dissemination in distinct Brazilian regions of
an epidemic
carbapenem-resistant Pseudomonas aeruginosa producing
SPM metallo-
-lactamase
2 Laboratório Especial de
Microbiologia Clínica, Division of Infectious Diseases,
Universidade Federal de São Paulo, Rua Leandro Duprét,
188, São Paulo, SP - 04025-010, Brazil
-lactamase (MBL). ![]()
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