Transmission of EHEC to humans occurs by many ways such as through consumption of undercooked meat, vegetables, and water contaminated by feces of carriers, person-to-person and contaminated environment contact. The risk of EHEC infection in humans from dairy farms can occur through the consumption of raw milk, dairy products, and contaminated meat from dairy cattle and through contamination of the dairy environment. Therefore, to reduce the risk of EHEC infection, it is important to improve the measures of control and also to enhance the management and to prevent the transmission of EHEC strains among animals, environment, and humans .