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Disease and tumor development in animals infected via the natural route of infection. (A) qPCR of MDV genome copies in the blood of chickens infected with the indicated virus via the natural route of infection. Geometric means of MDV genome copies per 1 × 106 cells are shown for 35 and 42 dpi (n = 24; Mann-Whitney U test, P = 0.007 for 35 and 42 days p.i.). (B) Survival analysis of contact birds infected with the indicated viruses.
