Prevalence and antibiotic resistance of Salmonella spp. and Escherichia coli isolated from poultry farms in the North Vietnam

Salmonella spp. and E. coli isolated from 515 samples collected from poultry farms at the north Vietnam. The results showed that the presence of E. coli in the poultry farm was 59.4%. The highest positive rate was fecal samples 78.0%; following by sewages samples (77.8%), poultry house floors swap samples (68.0%), drinking water (17.8%), tools samples (16.7%) and none of 45 food samples were E. coli positive isolation. In this study, 37 samples (7.2%) were Salmonella positive isolation including 10.0% fecal samples; 9.3% poultry house floors swap and 6.7% seweages samples. The E.coli isolates were highly resistant to tetracycline (85.3%), streptomycin (83.3%), ampicillin (61.8%), trimethoprim (56.9%) and nalidixic acid (55.9%). They were low resistant to ceftazidime (6.9%) and nitrofurantoin (12.7%). The other antibiotics such as norfloxacin, ciprofloxacin and gentamicin were resisted by E.coli isolates range from 15.7% to 32.4%. In our results, the Salmonella isolates were commonly resistant to streptomycin (89.2%), tetracycline (83.8%) and ampicillin (59.5%). Three antibiotic such as ciprofloxacin, gentamicin and norfloxacin were resisted by the Salmonella isolates with the similar rates (21.6%). Salmonella isolates showed resistance to ceftazidime at the lowest rate (16.2%). Of the isolated trains, 65.7% of the E. coli and 62.2% of the Salmonella isolates showed multi-drug resistance. The data suggest that detection of resistance isolates from chicken, poultry environment, and humans need for one health consideration in the usage of antibiotics in the poultry industry.