ARCHIV FUR LEBENSMITTELHYGIENE, cilt.57, sa.4, ss.113-117, 2006 (SCI-Expanded)
In this study, a total of 285 samples of raw minced calf meat, chicken carcasses and meatballs (ready-to-eat meat) were analysed for the presence of Escherichia (E.) coli and Serratia (S.) marcescens. From these samples, 223 E coli and 66 S. marcescens isolates were obtained, which were investigated for protease activity and antibiotic resistance. 21.2 % of the E coli and 17.9 % of the S. marcescens isolates showed proteolytic activity at +20 degrees C. Over 90 % of all E coli isolates were resistant to nalidixic acid and tetracycline. A high prevalence of ampicillin (89.6 %), kanamycin (80.7 %), chloramphenicol (78.9 %) and erythromycin (47.0 %) resistance was detected for E coli. All S. marcescens isolates were resistant to tetracycline. Resistance to erythromycin, chloramphenicol, nalidixic acid, kanamycin and ampicillin was seen in 40.9 %,37.8 %,31.8 %,30.3 % and 22.7 % of the S. marcescens isolates, respectively.