|PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
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Index Copernicus ICV 2015: 85.95
NAAS RATING 2017: 5.38
Enterobacteriaceae producing AmpC have become a major therapeutic challenge, as they may appear susceptible to expanded-spectrum cephalosporins when initially tested and may lead to therapeutic failure thereafter. Thus, a simple and reliable detection for AmpC producers is needed. Our aim was to assess different phenotypic tests for detection of plasmid mediated Amp C β lactamases (PMABLs) in Klebsiella pneumoniae compared to PCR for detection of family specific PMABL genes. Eighty clinical isolates of Klebsiella pneumoniae were screened for AmpC production by cefoxtin (FOX) resistance using disk diffusion test, tested by Cloxacillin Combined Disk Diffusion (CC-DD), Cefoxitin-Cloxacillin Double-Disk Synergy (CC-DDS), Ceftazidime-Imipenem Antagonism Test (CIAT), and Cefoxitin-Cefotaxime (FOX-CTX) Antagonism. PMABLs were detected in 26 (32.5%) out of 80 isolates. 40 (50 %) of 80 isolate were resistant to cefoxitin with (84.6%) sensitivity, 26 (32.5%) were positive CC-DD with (61.5%) sensitivity; 22 (27.5%) were positive (CC-DDS) with (38.5%) sensitivity; 4 (5%) were positive (CIAT) 6 (10%) were positive (FOX- CTX). In conclusion, CC-DD is a simple relatively sensitive and specific test for detection of PMABLs. CIAT and FOX- CTX antagonism tests are simple reliable tests for detecting the induced PMABLs.