DETECTION OF METALLO-BETA-LACTAMASE PRODUCING PSEUDOMONAS AND ACINETOBACTER SPECIES FROM DIFFERENT CLINICAL SPECIMENS IN A TERTIARY CARE HOSPITAL AT PUDUCHERRY.

ABSTRACT

Introduction Pseudomonas and Acinetobacter species are frequently isolated non-fermenting gram negative bacteria in a variety of hospital acquired infections. Metallo-beta-lactamases have become a serious threat in treating infections because of their multiple drug resistance including carbapenems. To determine Objectives the prevalence of MBL production among Pseudomonas and Acinetobacter species and to evaluate the different phenotypic MBL detection methods. A total of 104 isolates of carbapenem resistant Pseudomonas (78) and Materials and methods Acinetobacter (26) from different clinical specimens were tested for MBL production by Modi?ed Hodge Test, Combined Disk Test and Double Disk Synergy Test. Antibiotic susceptibility was performed by Kirby- Bauer Disk Diffusion method. Results Pseudomonas aeruginosa (11.29%) Acinetobacterbaumanii (11.53%) were the predominant MBL producers. MBL production was detected 61.53%, 84.61% and 38.46 % by DDST( Doule disc synergy test), CDT (Combined disc test), and MHT (Modi?ed Hodge test) respectively. Colistin and Polymyxin B are the only option available for treating such infections. MBL Conclusion production among Pseudomonas and Acinetobacter species are increasing due to the continuous use of carbapenems and selective antibiotic pressure. Strict antibiotic policy and infection control practices help prevent the further spread.