Presence of Listeria spp in fish samples, fish products and sea products
2011
Kuzmanović, J., Center for food analyses, Belgrade (Serbia) | Ašanin, R., Faculty of Veterinary Medicine, Belgrade (Serbia) | Baltić, M., Faculty of Veterinary Medicine, Belgrade (Serbia) | Mišić, D., Faculty of Veterinary Medicine, Belgrade (Serbia) | Dimitrijević, M., Faculty of Veterinary Medicine, Belgrade (Serbia) | Stojanović, M., Center for food analyses, Belgrade (Serbia) | Ašanin, N., City markets, Belgrade (Serbia). Public Utility Enterprise | Kovačević, I., Faculty of Medicine, Belgrade (Serbia)
Listeria monocytogenes is a bacterium that is pathogenic for man and for most animal species. Listeriosis is a generalized infection that starts after ingestion of the causative agent L. monocytogenes (Finlay, 2001). In this research, fish samples, fish products and sea products from Serbian markets were examinated such as: fresh fish (cooled), frozen food (fish and sea products – cuttlefish, squid, octopus, shellfish, crustaceans and shrimps), panned products; smoked fish, salted fish, thermally treated fish and fish products, semi-canned fish and canned fish. Microbiological testing has been performed according to internationally prescribed standards ISO 11290-1 (1996) Microbiology of Food and Animal Feed Stuffs – Horizontal Method for the Detection and Enumeration of Listeria monocytogenes. There were 470 samples from fish products and sea products. Presence of Listeria spp was registered in 58 samples (12.34%). Listeria monocytogenes was found in 1.92% samples (9 isolates), which makes 15.52% of the total Listeria that were isolated from the tested food. Other isolated Listeria belong to the following species: L. innocua (8.51%), L. welshimeri (1.28%), L.welshimeri/innocua (0.21%), L. grayi (0.21%) and L. seeligeri (0.21%). Exceptional viability of Listeria monocytogenes in the food tested was documented, also (freezing temperature – 18 deg C, five months).
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