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Journal of Advances in Medicine and Medical Research, ISSN: 2456-8899, ISSN: 2231-0614 (Past),Vol.: 23, Issue.: 3


Comparison of Various Phenotypic Methods for the Detection of Metallo-beta-lactamases in Pseudomonas aeruginosa


Sulmaz Reshi1*, Nargis Bali1, Munazah Manzoor1, Suhail Farooq2 and Dalip K. Kakru1

1Department of Microbiology, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, India.

2Department of Surgery, Sher-I-Kashmir Institute of Medical Sciences, Srinagar, India.

Article Information


(1) Crispim Cerutti Junior, Department of Social Medicine, Federal University of Espirito Santo, Brazil.

(2) Evangelos Marinos, University of Athens, School of Medicine, Laboratory of Biology, Athens, Greece.

(3) Salomone Di Saverio, Emergency Surgery Unit, Department of General and Transplant Surgery, S. Orsola Malpighi University Hospital, Bologna, Italy.


(1) Carlos Henrique Camargo, Instituto Adolfo Lutz, Brazil.

(2) Noha Tharwat Abou El-khier, Mansoura University, Egypt.

(3) C. I. Chikwendu, Federal University of Technology, Nigeria.

Complete Peer review History:


Aims: To evaluate the screening antibiotic and phenotypic test that can be used to confirm metallo-beta-lactamase (MBL) production in clinical isolates of Pseudomonas aeruginosa and to find out the prevalent MBL gene in them.

Materials and Methods: Three hundred and six isolates of P. aeruginosa were screened for resistance to meropenem (MEM), ceftazidime (CAZ) and imipenem (IMP). Isolates resistant to any of these were taken as screen test positive for MBL production and subjected to double disc synergy test (DDST) and combined disc synergy test (CDST), using MEM, CAZ and IMP with and without EDTA. Broth microdilution with MEM and IMP with and without EDTA was done to confirm MBL production (four fold reduction in minimum inhibitory concentration, MIC). Polymerase chain reaction (PCR) for blaVIM and blaIMP was done to find the prevalent gene in P. aeruginosa isolates.

Results: MEM picked up the highest number of MBL positive isolates 28.8% (n=76). CDST using MEM confirmed all the 76 screen test positive isolates to be MBL producers. Sensitivity of CDST using MEM, CAZ and IMP was 100%, 92.7% and 88.4% respectively. MIC by microbroth dilution for MEM and IMP was done for 76 MEM and 70 IMP positive isolates. For MEM maximum number of isolates had an MIC of 16 µg/ml and for IMP maximum number of isolates had an MIC of 32 µg/ml. blaVIM was the predominant MBL gene in P. aeruginosa isolates.

Conclusion: Meropenem was found to be a better screening as well as confirmatory agent for MBL detection. blaVIM was the predominant MBL gene in P. aeruginosa in our hospital.

Keywords :

Combined disc synergy test; double disc synergy test; Metallo-beta-lactamase; polymerase chain reaction.

Full Article - PDF    Page 1-8

DOI : 10.9734/JAMMR/2017/28865

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