PREVALENCE AND MOLECULAR CHARACTERIZATION OF blaCTX-M-15-PRODUCING PATHOGENIC GRAM-NEGATIVE BACTERIA FROM VARIOUS CLINICAL SAMPLES

Objective: The objective of this study was to describe the prevalence and molecular characterization of blaCTX-M-15-producing pathogenic Gram-negative bacteria from various clinical samples isolated from clinically suspected patients.Methods: In this study, clinical samples of urine, stool, sputum, and pus were collected from 244 patients with nosocomial infections. The phenotypic identification of extended-spectrum I²-lactamases (ESBL) was confirmed by double-disk synergy test and combined disk diffusion test. In vitro, the susceptibility pattern of antimicrobial agents against pathogenic isolates was performed by Kirby–Bauer disk diffusion method. The identification of blaCTX-M-15-producing Escherichia coli was assessed by polymerase chain reaction method.Results: The frequency of ESBL-producing pathogenic bacteria from screened was 6 (46.15%). In vitro, susceptibility to pathogenic bacteria showed that the majority of isolates were highly susceptible to amoxicillin-clavulanic acid (97.87%), ofloxacin (93.33%), and Pseudomonas aeruginosa showed 100% sensitive to ceftazidime, cefotaxime, cefixime, cefoperazone, and meropenem (92.30%). The rates of resistance to other antibiotics varied from <26.66%. Among six tested isolates, only one E. coli isolates showed blaCTX-M-15 gene.Conclusion: Due to the increase of E. coli with multiple ESBL genes, continuous surveillance should be needed in clinical field to use of appropriate antibiotics and the control of infections.