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We determined the phenotypic profile of multidrug-resistant (MDR)  Escherichia coli  isolated from 698 samples (390 and 308 from poultry and domestic pigs, respectively). In total, 562  Enterobacteria  were isolated. About 80.5% of the isolates were  E. coli . Occurrence of  E. coli  was significantly higher among domestic pigs (73.1%) than in poultry (60.5%) ( p  = 0.000). In both poultry and domestic pigs,  E. coli  isolates were highly resistant to tetracycline (63.5%), nalidixic acid (53.7%), ampicillin (52.3%), and trimethoprim/sulfamethoxazole (50.9%). About 51.6%, 65.3%, and 53.7% of  E. coli  were MDR, extended-spectrum beta lactamase-producing  enterobacteriaceae  (ESBL-PE), and quinolone-resistant, respectively. A total of 68% of the extended-spectrum beta lactamase (ESBL) producers were also resistant to quinolones. For all tested antibiotics, resistance was significantly higher in ESBL-producing and quinolone-resistant isolates than the non-ESBL producers and non-quinolone-resistant  E. coli . Eight isolates were resistant to eight classes of antimicrobials. We compared phenotypic with genotypic results of 20 MDR  E. coli  isolates, ESBL producers, and quinolone-resistant strains and found 80% harbored  bla CTX-M, 15%  aac ( 6 )- lb - cr , 10%  qnrB , and 5%  qepA . None harbored TEM, SHV,  qnrA ,  qnrS ,  qnrC , or  qnrD . The observed pattern and level of resistance render this portfolio of antibiotics ineffective for their intended use.

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Multidrug-Resistant, Including Extended-Spectrum Beta Lactamase-Producing and Quinolone-Resistant, Escherichia coli Isolated from Poultry and Domestic Pigs in Dar es Salaam, Tanzania