Prevalence and-resistance patterns of Salmonella spp. serotypes from humans and production animals in Canada

Abstract

The aim of the study was to compare the serotypes and antimicrobial resistance patterns of Salmonella from humans, pigs and poultry. Fecal samples were processed using conventional enrichment and culture procedures. Randomly selected isolates were tested against 12 different antimicrobial agents (ampicillin, amoxycillinlclavulamic acid, chloramphenicol, ceftiofur, enrofloxacin, gentamicin, neomycin, spectinocycin, streptomycin, sulfisoxazol, tetracyclin and sulfamethoxazol/trimetroprim) by the Kirby-Bauer technique. The prevalence of Salmonella was evaluated at 20,9% (18,9-23,0 %) in finishing pigs, 13,4% (12,0-14,9 %) in poultry and 2,9 (2,1-3,8 %) in humans. These isolates belonged to 22 different serotypes. Three serotypes were identified in all species, namely Typhimurium, Heidelberg and Agona. Multiple resistance was found in 26,7% of humans, 84,2 % of pigs and 71 ,4 % of poultry strains of S. Typhimurium. Antimicrobial resistance was thus commonly observed in humans, pigs and poultry isolates recovered in this study