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Mortality in chickens inoculated with rMd5, rMd5-MeqGCN, and rMd5ΔMeq. Chickens were inoculated with 2,000 PFU of the indicated viruses at 1 day of age and maintained in isolation for 8 weeks, and weekly mortality was recorded. Uninoculated chickens served as negative controls. Chickens that died during the experiment were evaluated for MDV-specific gross lesions.
