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PAFMJ-Pakistan Armed Forces Medical Journal. 2017; 67 (6): 1026-1029
in English | IMEMR | ID: emr-193405

ABSTRACT

Objective: To determine, the susceptibility pattern of carbapenamase producing enterobacteriaceae [CPE] against polymyxinB, tigecycline and fosfomycin


Study Design: Descriptive cross sectional


Place and Duration of Study: The study was carried out in the Department of Microbiology PNS Shifa Karachi, from 26 Sep 2013 to 25 Mar 2014


Material and Methods: All specimens were inoculated on blood and macConkey agar, incubated aerobically at 35degreeC - 37degreeC for 18 to 24 hours. After identification of gram negative rods by colony morphology, Gram's staining and biochemical reactions, these were screened for Carbapenems resistance with imipenem and meropenem 10 microg discs along with routine first and second line antibiotics by Kirby-Bauer disc diffusion technique according to Clinical Laboratory Standard Institute [CLSI] guide lines. All isolated CPE were saved and then inoculated on Mueller-Hinton agar [MHA]. Antimicrobial susceptibility against polymyxin B, Tigecycline and Fosfomycin was done by Kirby-Bauer disc diffusion method using disc polymyxin B 300 units, Tigecycline 15microg and Fosfomycin 200microg. Zone diameters greater than 24 mm were taken as sensitive for Tigecycline 15microg, 16mm for Fosfomycin 200 microg and 12 mm for polymyxin B 300 units


Results: Clinical specimens of 171 patients who fulfilled the inclusion criteria were included in our study. Mean +/- SD of age was 42.02 +/- 22.367 with C.I [38.65 - 45.40]. Out of 171 patients 110 [64%] were male and 61 [36%] were female. In vitro susceptibility results revealed that all the 171 [100%] CPE isolates susceptible to PolymyxinB, while susceptibility against Fosfomycin and Tigecycline was 132 [77%] and 49 [29%] respectively


Conclusion: CPE were found to be 100% susceptible to polymyxinB, while for Fosfomycin and Tigecycline susceptibility was 77% and 29% respectively

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