M. Rabbani Khorasgani1, S. Bokaie2, S. A. Moallemzadeh3 and T. Zahraei Salehi4
Department of Microbiology and Immunology,1,4 Department of Food Hygiene2, Veterinary Graduate, Tehran University, Tehran, Iran3, Department of Microbiology and Immunology , Faculty of Veterinary Medicine,
Tehran University, Tehran- Iran, P.O.Box: 14155-6453, Tehran, Iran.