The present study was undertaken to determine the prevalence of Listeria monocytogenes in selected raw materials and food products of animal origin in Poland. In total, 1118 fish and fish products, and 2172 meat and meat products samples were examined by using ISO culture method. Out of 478 pork samples examined 45 (9.41%) contained L. monocytogenes. Out of the 317 samples of beef the microorga...