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Survival percentage (A), mean antibody titers at 21 dpi (B), clinical scores (C) and representative gross lesions (D–U) in chickens experimentally infected with the YN and YN attenuated strains. Each column represents the mean titers± standard deviation (SD) (n = 10). Bars indicate mean ± SD. The significance was considered as follows: significant at P ≤ 0.05 (*), highly significant at P ≤ 0.01 (**), and very highly significant at P ≤ 0.001 (***).
