2014 Volume 67 Issue 6 Pages 442-448
A total of 250 commercial chicken meat samples were examined for the contamination rates of Campylobacter and Salmonella species and the most probable number (MPN) in the meats. Campylobacter spp. was detected at a rate of 61.0% (94/154) in domestic chickens and 28.1% (27/96) in imported ones. While C. jejuni was the major species of the isolates, the rate of C. coli in imported chickens was higher than that in domestic ones. Most Campylobacter-positive samples were contaminated with less than 3.0 log MPN/100g. Salmonella spp. was detected at a rate of 47.4% (73/154) in domestic chickens and 17.7% (17/96) in imported ones. The major serotype of the isolates from domestic chickens was S. Infantis, while S. Enteritidis was the major serotype from imported ones. Most Salmonella-positive samples were contaminated with less than 2.0 log MPN/100g. The antimicrobial susceptibility, using five drugs for Campylobacter isolates and 12 drugs for Salmonella isolates, showed that 42.4% (114/269) and 100% (90/90) were resistant to one or more drugs, respectively. Among the resistant C. jejuni strains, 35.2% (64/182) of the isolates from domestic chickens and 45.3% (24/53) of the isolates from imported chickens showed multiple resistances to nalidixic acid (NA), norfloxacin (NFLX), ofloxacin (OFLX) and ciprofloxacin (CPFX). In addition, eight C. coli strains obtained from imported chickens exhibited resistance to erythromycin (EM). As for Salmonella, 12.1% (8/66) of S. Infantis and 90.9% (10/11) of S. Enteritidis were resistant to NA.
