[1] Univ Guelph, Ontario Vet Coll, Dept Pathobiol, Guelph, ON N1G 2W1, Canada
[2] Ferdowsi Univ Mashhad, Sch Vet Med, Dept Clin Sci, Mashhad 9177948974, Iran
[3] Shiraz Univ, Sch Vet Med, Dept Pathobiol, Div Biotechnol, Shiraz 7155713876, Iran
[4] Ferdowsi Univ Mashhad, Sch Vet Med, Dept Pathobiol, Mashhad 9177948974, Iran
[5] Univ Tehran, Fac Vet Med, Dept Microbiol & Immunol, Tehran 1419963114, Iran
[6] Univ Tehran Med Sci, Expt Med Res Ctr, Tehran 1416753955, Iran
[7] Shahrekord Univ, Sch Vet Med, Dept Pathol, Shahrekord 8818634141, Iran
[8] Shahrekord Univ Med Sci, Clin Biochem Res Ctr, Sch Med, Shahrekord 8815713471, Iran
[9] Univ Western Ontario, Schulich Sch Med & Dent, Dept Med Sci, London, ON N6A 3K7, Canada