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Growth rates and the ratios of bursa or thymus over body mass of chickens challenged with distinct MDVs. (a) Growth rates of virus-challenged birds. (b,c) Ratios of thymus or bursa over body mass of birds. For each group, the body masses, bursa masses, and masses of five randomly selected birds were measured in the first three weeks post-challenge. Black double stars indicate significant difference (p < 0.01) to CEF-mock controls.
