Ruminant animals are considered as one of the most important reservoirs of STEC, which shed bacteria with their feces into the environment without showing any clinical manifestation of the disease and the organisms contaminate the raw milk and the meat causing foodborne disease for the human consuming such food ( Alikhani et al., 2006 and Mora et al., 2005). Therefore, products of animal origin, such as meat and milk, are at risk of contamination with STEC originating from animals ( Jafari et al., 2009 and Altalhi and Hassan, 2009).