[1] Urmia Univ, Dept Pathobiol, Fac Vet Med, Orumiyeh, Iran
[2] Mashhad Univ Med Sci, Dept Allergy & Immunol, Mashhad, Iran
[3] McMaster Univ, Dept Pathol & Mol Med, Hlth Sci Ctr, Hamilton, ON, Canada
[4] Pasteur Inst Iran, Dept Bacterial Vaccines, Karaj, Iran