ABSTRACT
The immunogenecity of combined Turkey RhinoTrachitis Virus [TRTV] and Pasterella multocida inactivated oil emulsion vaccine were evaluated in comparison to both the monovalent [TRT] and [P. Multoocida] vaccines. Sixty turkeys poults were divided into four groups, group 1, 2, and 3 were vaccinated with [TRTV], Pasterella multocida and combined [TRTV + Pasterella multocida] vaccines respectively while group 4 was kept as non vaccinated control, obtained results of cellular [Detected by lypmphocyte blastogenesis assay] and Humoral [Detected by indirect haemagglutination IHA, Enzyme linked Immuno Sorbant assay ELISA, and Serum neutralization test S.N.T] immune responses of experimentally vaccinated poults revealed that 2 successive doses of the prepared vaccines with 21 days apart produce protective immune response started at 3 weeks post vaccination and lasted for 12 weeks covering the whole fattening period