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        Incidence of Listeria in Egyptian Meat and Dairy Samples

        Ahmed Abdel-Rhman Ismaiel,Ali El-Sayed Ali,Gamal Enan 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.1

        A total of 180 food samples including meat(raw lean beef, frozen lean beef, and frozen chicken) anddairy products (raw milk, Zabady and Kareesh cheese)were analysed for Listeria. Isolates were differentiatedusing morphological, cultural, and biochemical tests and anAPI-Listeria kit. Zabady cheese was completely free ofListeria. The highest incidence rate (13.33%) was in frozenlean beef. Raw lean beef and milk products showed anincidence rate of 6.67%. The lowest incidence rate (3.33%)was in Kareesh cheese and frozen chicken meat samples. L. monocytogenes showed the lowest incidence rate(0.55%), isolated from one frozen lean beef sample. L. ivanovii and L. grayi showed the highest incidence rate(2.22%), isolated from 4 samples. L. innocua and L. seeligeri were positive in 3 samples (1.67%), and L. welshimeri in 2 samples (1.11%). L. monocytogenes and L. ivanovii were positive for virulence factors (hemolyticproperties, and extracellular enzyme activities).

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