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Twenty chicks, 12 turkey poults and 10 ducklings, all 5 weeks old were infected with 2 × 103.5 chick LD50 IBD virus to determine the course of the virus in the 3 poultry species. Uninfected control birds were kept separately. Two infected and 2 control birds/species were euthanized at time intervals between 3 and 168 hours post infection (pi). Sections of thymus, bursa of Fabricius, spleen, liver,...
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