Abstract
This study aimed to screen and characterize colistin-resistant strains isolated from different livestock species in Algeria, including sheep, goats, and dromedaries. A total of 197 rectal and nasal swabs were screened for colistin-resistant Gram-negative bacilli. 21 isolates were selected, identified, and their antibiotic resistance was phenotypically and genotypically characterized. The majority (15/21) were affiliated to E. coli, from which 4 strains isolated from sheep (n=2) and goats (n=2) and belonging to phylogroup A and ST10 and ST6396 lineages, respectively, carried the mcr-1 gene. The remaining isolates were identified as belonging to the following genera: Raoultella, Enterobacter, Klebsiella, and Pseudomonas. This study highlights the presence of virulent and multi-resistant Gram-negative bacilli in farm animals, increasing the risk of transmitting potentially fatal infections to humans.
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