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Detection and Characterization of Metallo-β-lactamases in Pseudomonas aeruginosa by Phenotypic and Molecular Methods from Clinical Samples in a Tertiary Care Hospital

Issue: 
DOI: 
10.7727/wimj.2012.183
Pages: 
778–83

ABSTRACT

Aims: The aim of this study was to detect and characterize the presence of metallo-β-lactamase (MBL) production in multidrug resistant (MDR) P aeruginosa collected from clinical samples in a tertiary care hospital.
 
Methods and materials: A total of 67 non-repetitive isolates of MDR P aeruginosa recovered from various clinical specimens were screened for MBL production by IPM/MEM-EDTA combined disc test. Polymerase chain reaction was performed on all isolates using blaIMP and blaVIM consensus primers to characterize them genotypically.
 
Results: Among 67 P aeruginosa isolates, 62.7% (42/67) and 70.1% (47/67) were resistant to imipenem and meropenem respectively and 47 (70.1%) were found to be MBL producers. Among this 47 MBL-producing isolates, 41 (61.1%) strains carried the blaVIM gene and 2 (3%) strains carried the blaIMP gene. Three strains were phenotypically negative but positive genotypically for blaVIM gene. One strain was resistant to both imipenem and meropenem but did not show phenotypic positivity.
 
Conclusion: This study confirms the dissemination of blaVIM genes among MDR Pseudomonas aeruginosa and hence it is indispensible to identify and aptly control the threat of horizontal and vertical transfer.
 
 
 
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e-Published: 08 Apr, 2013
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