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Serum level of IL-2 and IFN-γ in the vaccinated chickens. The serum levels of Th1 cytokines, IL-2 (A) and IFN-γ (B) were determined in pBudVP2VP1-, pBudVP2-VP1/VP22- and the control group. The results showed higher levels of IL-2 and IFN-γ in the immunized groups compared to those from the control group.
