The treatment of Klebsiella pneumoniae infections has become more difcult due to the emergence of multidrug-resistant strains. Fluoroquinolones have been widely used to treat respiratory tract infections and urinary tract infections caused by different bacteria. Therefore, this study aimed to evaluate fluoroquinolones resistance and detect ESBL producers in various clinical samples in Duhok Province, Iraq. K. pneumoniae was identied from different clinical samples by conventional microbiological tests. In addition, antibiotic susceptibility was detected by the KirbyBauer disc diffusion method. Out of 120 K. pneumoniae isolates, 73.3% were causing urinary tract infections, in most cases, 74.2% were among females and 25.8% among males, and among those 120 isolates, 76.7% of isolates were from outpatients, and 23.3% were inpatients. The resistance rate among all samples was 52.5%, 36.7%, 33.3%, 33.3%, ciprofloxacin, levofloxacin, norfloxacin, and ofloxacin, respectively in urine samples, the resistance to nalidixic acid was 22.5%. Among 120 samples, only 12 isolates were hypermucoviscosity. About 25% of ciprofloxacin and 17.5% of levofloxacin resistances were ESBL producers simultaneously. According to this study, K. pneumoniae is more susceptible to norfloxacin, ofloxacin, and nalidixic acid than ciprofloxacin and levofloxacin. Additionally, this study establishes a link between ESBL and fluoroquinolone resistance.
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