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Abstract : Resistance to numerous antibiotics has emerged as a result of the development of extended-spectrum β-lactamases (ESBLs) generated in Pseudomonas fluorescens. As a result, failing to diagnose ESBL strains properly can result in treatment failure. The goal of this research was to look at the development of ESBLs in P. fluorescens isolated from sepsis blood patients in Al-Najaf. Sensitivity testing demonstrated that 32 (100%) of the P. fluorescens isolates were resistant to at least one of the β-lactam antibiotic. Of 32 isolates, 22 (68.6%) isolates were bearing blaTEM gene and 19 (59.4%) isolates were bearing blaSHV gene, of these isolates, 19 isolates carried the two genes together, but only 16 (50%) and 13 (40.6%) had blaCTX-M and blaOXA genes, respectively. The high rate of ESBL genes found in Pseudomonas fluorescens isolates and these instances is concerning, according to the current investigation.

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