PHENOTYPIC DETECTION OF AMPC β-LACTAMASE ENZYME IN GRAM-NEGATIVE BACILLI
DOI:
https://doi.org/10.17656/jsmc.10152Keywords:
AmpC β-lactamase detection, Enterobacteriaceae, Gram-negative bacilli, SulaimaniAbstract
Background
Bacterial resistance to antimicrobials are achieved by several mechanisms including production of enzymes such as β-lactamases; according to Ambler classification, β-lactamases are classified into four classes, A to D. AmpC β-lactamase production is related to chromosomal or plasmid genes expression in Gram-negative bacteria.
Objectives
To determine AmpC β-lactamase production among hospital isolates of Enterobacteriaceae and non-fermener Gram-negative bacilli in Sulaimani providence and to evaluate different phenotypic methods for detection of AmpC β-lactamase.
Materials and Methods
A total of 108 Gram-negative bacilli bacterial isolates collected from different infections in several governmental hospitals in Sulaimani city were assessed for β-lactamase production. The isolates were identified using biochemical methods. Antimicrobial susceptibility test was performed by Bauer-Kirby disk diffusion method using 14 antimicrobial agents including cefoxitin. Cefoxitin-resistant isolates were tested for AmpC production by four phenotypic tests including disk approximation test, disk antagonism test, hodge test, and AmpC disk test.
Results
Among 108 isolates, 47 (43.5%) were Escherichia coli and 35 (32.4%) were Pseudomonas aeruginosa. From the isolates, 98.1% were resistant to ampicillin while 71.3% were sensitive to imipenem and 68 isolates (63%) were resistant to cefoxitin. We found that 59 out of 68 to cefoxitin-resistant isolates (86.8%) produce AmpC by hodge test while other tests detected less AmpC production. In regard to hodge test, specificity of the other three tests reached 100% while sensitivity ranged from 55.93 in disk approximation test to 79.66% from both disk antagonism test and AmpC disk test.
Conclusion
AmpC b-lactamase production was common among Gram-negative bacilli from hospital isolates. Cefoxitin screening followed by hodge test for AmpC production was the best test to find b-lactamase producers. Different AmpC b-lactamase production tests can be used according to the tested bacteria.
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