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A cross-sectional study was carried out to determine antimicrobial drug resistance patterns of  E. coli  O157:H7 isolates and estimate the level of the pathogen. A total of 194 cloacae swab samples were collected randomly in two poultry farms. Standard cultural, biochemical, and serological (latex agglutination) methods were used to isolate  E. coli  O157:H7. The isolates were subjected to antimicrobial susceptibility testing using disc diffusion method. Out of 194 cloacae samples examined, 13.4% ( n  = 26) were found to be positive for  E. coli  O157:H7. The finding indicated differences in  E. coli  O157:H7 infection among the different risk factors. Chicken from Adele Poultry Farm showed higher  E. coli  O157:H7 infection (OR = 3.89) than Haramaya University poultry farm and young birds had more infection (OR = 4.62) than adult birds. Of the total 14 antimicrobials included in the panel of study, the susceptibility results were varied with 96.15% and 0%  E. coli  O157:H7 isolates expressing resistance to erythromycin, clindamycin, spectinomycin, and ciprofloxacin, respectively. Multidrug resistance to more than two antimicrobial agents was detected in 24 (92.30%) of the isolates. The study showed high presence of antimicrobial resistant isolates of  E. coli  O157:H7. Further study is required to better understand the ecology and evolution of bacterial resistance to antimicrobial agents.

Cloacael Carriage and Multidrug Resistance Escherichia coli O157:H7 from Poultry Farms, Eastern Ethiopia