Abstract: This study concerned to investigate food borne pathogens Listeria species. The genus Listeria is an opportunistic pathogen in humans and various animal species. Listeria sp. are wide distribution. Despite their poor survival in nutrient-deficient, unpolluted seawater and spring water, Listeria sp. Healthy cows can serve as reservoirs for L. monocytogenes and secrete the organism in milk. Almost all cases (about 98%) of human listeriosis and 85% of animal cases are due L. monocytogenes although, rarely L. seeligeri and L. ivanovii have also been implicated. L. ivanovii, the other pathogenic species of genus Listeria has been thought to be frequently associated with abortions in sheep and in cattle. In humans, L. ivanovii infection is rare and has been reported from a patient with AIDS.