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Antimicrobial resistance profiles in indicator and zoonotic bacteria isolated from faeces of healthy animals without clinical signs of the following species: bovine, equine, ovine, porcine, layer hens, and canine, were studied. The chosen antimicrobials are frequently used in veterinary and human medicine. The agar diffusion was the method used. The obtained results of 240 Escherichia coli, 189 Enterococcus spp., 11 Campylobacter spp. and 2 Salmonella Gaminara (16:d:1,7) showed a greater percentage of resistance and multiresistance in intensive breeding animals, porcine and layer hens. The observed resistance to ampicillin, streptomycin, tetracycline and nalidixic acid in E. coli coincides with the antimicrobials most commonly used on animal farms, the same as tetracycline and erythromycin in Enterococcus spp. The strains of Salmonella Gaminara (16:d:1,7) were susceptible to the antimicrobials tested. In Campylobacter spp. the scarce number of isolates hindered an adequate interpretation of the results. Owing to the lack of data in our country on antimicrobial resistance in indicator and zoonotic bacteria in domestic animals, we consider that the obtained values could be used as a starting point for a future monitoring program.

Antimicrobial resistance of Escherichia coil isolated from pigs in Argentina. Sixty-nine Escherichia coli isolates from healthy pigs or with clinical signs non-compatible with diarrhea caused by this microorganism, were studied. The purpose was to determine the resistance profile against antimicrobials frequently used in veterinary and human medicine. The agar diffusion method was used. High resistance percentages against antimicrobials used in swine farms such as ampicillin, streptomycin and tetracycline were observed, as well as against trimetoprim-sulfametoxazole and chloramphenicol, compounds that were stopped being used several years ago. Sixty two percent of isolates showed multidrug-resistance. The results obtained in this work corroborate the hypothesis that the phenotypic distribution of resistance and possibly that of its genetic determinants, are directly influenced by the antimicrobial treatments used.