Antimicrobial resistance and multi-drug resistance patterns have been carried out on total of 210 isolated of Salmonella spp. and pathogenic E. coli isolated from food poisoning patients on January through December 2012 in Incheon, Korea. The highest percentage of antibiotics resistance was found to the following antimicrobial agents: tetracycline 43.8%, ampicillin 34.8%, nalidixic acid 23.8%, sulfamethoxazole/trimethoprim and chloramphenicol 12.4%, and ampicillin/sulbactam 11.4%. The highest percentage of resistance was 37.5% to ampicillin for Salmonella spp. and 59.0% to tetracycline for pathogenic E. coli. Overall the multidrug resistance rates of 1 drug was 26.2%, 2 drugs 9.0%, 3 drugs 9.5%, 4 drugs 7.1%, and 5 or more drugs 12.46%. The multi-drug (MDR) strains to four or more antimicrobial agents among the resistant organisms were quite high: 15.9% and 22.1% for Salmonella spp. and pathogenic E. coli, respectively. The study implies that limitation of unnecessary medication use is pertinent in order to maintaining the efficacy of drugs.

One hundred isola tes of Staphylococcus aureus were obtained from feces samples of patients with food poisoning. The a ntibiotic susceptibility against vari ous antibiotics was examined by disc diffusion test . The S. aureus isolates had 92% resista nce to peni cillin. They also had 30% resistance to ampicillin and erythromycin. respect ively. The percentage of re sistance to oxacillin was 14%. Three vancomycin resistant isolates were also found. The minimal inhibitory co ncen tra ti on(MIC)s of antibiotics were examll1ed Antibiotics-intermediate S a ureus isolates were not det ected by disc dif fu sion t est