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IBV-specific antibody levels in vaccinated chicken sera (0, 7, 14, 21 and 28 days post-vaccination (dpv)) detected by indirect ELISA. Letters (a–c) indicate significant differences among vaccinated groups (p < 0.05). ** and * indicate p < 0.01 and p < 0.05 between vaccinated and nonvaccinated groups, respectively. (n = 10 chickens/group.)
