1997, Number 3
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ABSTRACTThe frequency of resistance to different antimicrobials was studied in 122 strains of Salmonella obtained from bovine feces, animal excreta recycled for animal feeding and in bovine mesenteric lymph nodes. Strains were tested for resistance to 10 antimicrobials by the disk diffusion method described by the National Committee for Clinical Laboratory Standards. Resistance to one or more antimicrobials was observed in 73 (59.8%) of the tested strains. Forty-nine (67.1%) of these strains showed multiple resistance. Resistance to at least one of the tested antimicrobials was found in 26.3% of the strains from bovine feces, 69% from recycled manure, and 59.4% from lymph nodes. Resistance to tetracycline (57.4%) was the most commonly detected, followed by streptomycin (22.1 %) and chloramphenicol (20.5%). No strains exhibited resistance to cephalothin or nalidixic acid. Of the 16 resistance patterns identified, 14 (87.5%) contained a resistance determinant for tetracycline and 10 (62.5%) for streptomycin. Twenty out of the 25 examined serovars of Salmonella showed resistance to at least one of the tested antimicrobials, and 15 showed multiple resistance. Results emphasize the need to regulate the use of antimicrobials in animal husbandry in Mexico, as well as improve a program for monitoring the drug resistance in Salmonella isolates from different sources in an attempt to identify the trends of antimicrobial resistance and control its dissemination.
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