Screening the Presence of Non‐Typhoidal Salmonella in Different Animal Systems and the Assessment of Antimicrobial Resistance

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In this study, for the first time in Chile, we compared resistance profiles of Sal‐ monella strains isolated from 4047 samples from domestic and wild animals. A total of 106 Salmonella strains (2.61%) were isolated, and their serogroups were characterized and tested for susceptibility to 16 different antimicrobials. This study reports 47 antimicrobial‐resistant (AMR) Salmonella strains (44.3% of total strains). Of the 47, 28 corresponded to single‐drug resistance (26.4%) and 19 to mul‐ tidrug resistance (17.9%). The association between AMR and a subset of independent variables was evaluated using multivariate logistic models. Interestingly, S. Enteritidis was highly persistent in animal production systems; however, we report that serogroup D strains were 18 times less likely to be resistant to at least one antimicrobial agent than the most common serogroup (serogroup B). The antimicrobials presenting the greatest contributions to AMR were ampicillin, streptomycin and tetracycline.

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