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Article history: Received May 02, 2020 Accepted June 07, 2020 Available online June 23, 2021 Shepherd dogs have been implemented in the transmission and distribution of many threatening pathogens. The presence of extended-spectrum-cephalosporin resistant Escherichia coli (ESCR E. coli) in dog feces can constitute a significance risk to human health due to transmission of antibiotics resistance from dogs to humans, other animals and the surrounding environment. Therefore, in this study, phenotypic and molecular characterization of fecal ESCR E. coli were investigated in shepherd dogs accompanied sheepherders in urban areas. Sixty-seven fresh fecal samples were collected from shepherd dogs from different regions of Mosul city. Bacteriological examination of ESCR E. coli was done using MacConkey agar with cefotaxime followed by subsequent PCR confirmation of the CTX-M gene using specific primers and molecular characterization using specific primers directed to CTX-M-1, 2 and 9 groups. The results of bacterial examination showed successful confirmation of ESCR E. coli which has been isolated from fecal samples of shepherd dogs 58.2% (39/67). In addition, detection of CTX-M gene was confirmed in 53.7% (36/67) of E. coli isolates. Furthermore, molecular characterization of CTX-M gene revealed the presence of only one genotype belongs to CTX-M-1. However, both of CTXM-2 and CTX-M-9 genotypes were not detected in this study. This study concluded that shepherd dogs have an essential role in carrying and spreading of ESCR E. coli especially in urban regions.

Molecular characterization of extended spectrum cephalosporin resistant Escherichia coli isolated from dogs