listeria spp

Acta Veterinaria-beograd

Listeria monocytogenes is a bacterium that is pathogenic for man and for most\n animal species. Listeriosis is a generalized infection that starts after\n ingestion of the causative agent L. monocytogenes (Finlay, 2001). Food that\n is not properly thermically processed, long storage of such food, food that\n is produced in inadequate hygienic food plants, as well as cooked-cooled\n ready to eat food (RTE) is the ideal medium for listeria multiplication. High\n risk food originated from fish, fish products and sea products comprised of:\n molluscs (fresh of frozen shellfish, crustaceans shelled or not), fresh fish\n (ready to eat without cooking), fish products packed with brine (NaClamp;amp;lt;6%),\n (salted, marinated, fermented, cold smoked and fish in brine), thermically\n treated fish and crustacean products (pasteurization, cooking, hot smoking,\n including pre-cooking and panning). In this research, fish samples, fish\n products and sea products from Serbian markets were examinated such as: fresh\n fish (cooled), frozen food (fish and sea products - cuttlefish, squid,\n octopus, shellfish, crustaceans and shrimps), panned products; smoked fish,\n salted fish, thermally treated fish and fish products, semi-canned fish and\n canned fish. Microbiological testing has been performed according to\n internationally prescribed standards ISO 11290-1 (1996) amp;amp;quot;Microbiology of food\n and animal feed stuffs - Horizontal method for the detection and enumeration\n of Listeria monocytogenesamp;amp;quot;. There were 470 samples from fish products and sea\n products. Presence of Listeria spp was registered in 58 samples (12.34%).\n Listeria monocytogenes was found in 1.92% samples (9 isolates), which makes\n 15.52% of the total Listeria that were isolated from the tested food. Other\n isolated Listeria belong to the following species: L. innocua (8.51%),\n L.welshimeri (1.28%), L.welshimeri/innocua (0.21%), L. grayi (0.21%) and L.\n seeligeri (0.21%). Exceptional viability of Listeria monocytogenes in the\n food ...

Presence of Listeria spp. in fish samples, fish products and sea products