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Carbapenem resistance among Pseudomonas aeruginosa strains from India: evidence for nationwide endemicity of multiple metallo-beta-lactamase clones (VIM-2, -5, -6, and -11 and the newly characterized VIM-18).

ABSTRACT: Among 57 metallo-beta-lactamase (MbetaL)-producing Pseudomonas spp. detected in India during 2006, five bla(VIM) genes were found, including a newly characterized bla(VIM) gene. Pseudomonas aeruginosa strains were clustered in 33 ribotypes with clones found in multiple hospitals. Several types of bla(VIM-2)-carrying integrons were detected. The newly characterized variant VIM-18 showed a 4-amino-acid deletion compared to other VIM variants. In this study, we show that VIM-producing Pseudomonas spp. were highly prevalent in India with a great diversity of bla(VIM) types and MbetaL-carrying integrons.

SUBMITTER: Castanheira M

PROVIDER: S-EPMC2650547 | biostudies-literature | 2009 Mar

REPOSITORIES: biostudies-literature

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Carbapenem resistance among Pseudomonas aeruginosa strains from India: evidence for nationwide endemicity of multiple metallo-beta-lactamase clones (VIM-2, -5, -6, and -11 and the newly characterized VIM-18).

Castanheira Mariana M Bell Jan M JM Turnidge John D JD Mathai Dillip D Jones Ronald N RN

Antimicrobial agents and chemotherapy 20081229 3

Among 57 metallo-beta-lactamase (MbetaL)-producing Pseudomonas spp. detected in India during 2006, five bla(VIM) genes were found, including a newly characterized bla(VIM) gene. Pseudomonas aeruginosa strains were clustered in 33 ribotypes with clones found in multiple hospitals. Several types of bla(VIM-2)-carrying integrons were detected. The newly characterized variant VIM-18 showed a 4-amino-acid deletion compared to other VIM variants. In this study, we show that VIM-producing Pseudomonas s ...[more]

PMID: 19114677

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Project description:The prevalence of imipenem resistance among Pseudomonas aeruginosa isolates at a 195-bed tertiary care medical center in Cali, Colombia, rose from 2% in 1996 to 28% in 1997 and to over 40% in 2003. Many isolates showed high-level multiresistance, and phenotypic characterization suggested the spread of a predominant strain with minor variants. Sixty-six resistant isolates collected between February 1999 and July 2003 from hospitalized patients (n = 54) and environmental samples (n = 12) were subjected to a fuller analysis. Genetic fingerprints were compared by pulsed-field gel electrophoresis (PFGE) of SpeI-digested genomic DNA, and bla(IMP) and bla(VIM) genes were sought by PCR. PFGE and serotyping indicated that 52 of the 66 isolates belonged to a single strain, with 82% similarity; the PFGE pattern for this organism was designated pattern A. Two further pairs of isolates represented single strains; the remaining nine isolates were unique, and in the case of one isolate, no satisfactory PFGE profile could be obtained. The pattern A isolates were mostly of serotype O12 and were highly resistant to imipenem (MICs, 32 to >256 microg/ml), with this resistance decreased eightfold or more in the presence of EDTA. They yielded amplicons with bla(VIM)-specific primers, and sequencing of DNA from a representative isolate revealed bla(VIM-8), a novel allele with three polymorphisms compared with the sequence of bla(VIM-2). Two of these nucleotide changes were silent, but the third determined a Thr139Ala substitution. Only 4 of 13 resistant isolates (2 clinical isolates and 2 environmental isolates) assigned to other PFGE types carried bla(VIM) alleles, whereas the others were less multiresistant and mostly had lower levels of imipenem resistance (MICs, < or =32 microg/ml) which was not significantly reduced by EDTA. No bla(IMP) alleles were detected. During 2003, when the environmental study was undertaken, serotype O12 isolates with bla(VIM) were recovered from sinks and stethoscopes in the most-affected units, although not from the hands of staff; the problem declined once these reservoirs were disinfected and hygienic precautions were reinforced.

Dataset Information

Carbapenem resistance among Pseudomonas aeruginosa strains from India: evidence for nationwide endemicity of multiple metallo-beta-lactamase clones (VIM-2, -5, -6, and -11 and the newly characterized VIM-18).

Publications

Carbapenem resistance among Pseudomonas aeruginosa strains from India: evidence for nationwide endemicity of multiple metallo-beta-lactamase clones (VIM-2, -5, -6, and -11 and the newly characterized VIM-18).

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