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Virulence of MDV replicates derived from a serially passed, BAC-cloned virus. Two bird trials (A and B) were conducted for Reps 1, 2, and 3 each at p55, p65, and p75, e.g., R1-A is replicate 1, trial A, at the indicated passages. In addition, the control strain Md5 was tested at p41, p51, and p61.
