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Survival percentage (A) and trachea ciliostasis scores (B) in chickens experimentally challenged with IBVYN and SD strains. 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 (***).
