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Efficacy test of ZYYR-2014 strain of different vaccine dosages. (A) Mean antibody OD values at 21 dpi. All data are presented as mean ± standard deviation (SD) (n = 20); *** indicates significant at P ≤ 0.001. (B) Phylogenetic tree of different IBV strains used in efficacy test. Black circle indicates the vaccine ZYYR-2014 strain. Black squares indicate challenge strains.
