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IBV- and NDV-specific antibody titers in serum. (A,B) are separate antibody titers against IBV and NDV. Titers are shown as mean S/P values + S.D. of each group. The threshold cut-off values of IBV and NDV ELISAs are both 0.2. S/P = [Sample A(650)–NC A(650)]/[PC A(650)—NC A(650)]. * and ** indicate p < 0.05 and p < 0.01, respectively.
