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Incidence of mortality in chickens inoculated with bac-GX0101 and GX0101ΔMeq. Chickens were inoculated with 1000 PFU of the indicated viruses when they were one-day-old and maintained in isolation for 13 weeks. Mock-inoculated chickens served as negative controls and weekly mortality was recorded. Chickens that died during the experiment were evaluated for MDV-specific gross lesions.
