This research project studied the prevalence of the main enteric pathogens in the environment of pig farms, and characterized both their phenotype and genotype. More precisely, the prevalence of Salmonella and Campylobacter among farm workers in direct contact with pigs, and among these animals has been studied. Also, evaluation of the antimicrobial resistance profiles of farms using (or not) the antibiotics tetracycline and enrofloxacin, and characterized the genetic loci responsible for this antibioresistance in these bacteria and in indicator microorganisms (E. coli) have been made. With regards to resistance of Campylobacter coli to tetracyclin, resistant strains in the herds of 51% of pig farms administrating this antibiotic and in 34% of the farms not using it have been found. Resistant strains of C. coli against enrofloxacin in 13% and 24% of herds using it or not, respectively has also been found. However, in both cases, these differences were not statistically significant. No strains of Salmonella and C. coli were found among workers. There was no significant difference concerning the resistance to tetracyclin between strains of E. coli found among workers in direct contact with herds using or not this antibiotic. This study shows that the resistance profiles of herds to antibiotics are only weakly associated with the antibiotics used. Furthermore, prevalence of Campylobacter and Salmonella among people in direct contact with animals appeared very weak.