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Histopathological appearance of bursal and spleen from IBDV-inoculated SPF chickens. The bursal and spleen samples were fixed by immersion in 10% neutral-buffered formalin, routinely processed, embedded in parafn, sectioned (4 μm thick), and stained with hematoxylin and eosin. Histological changes were examined by light microscopy. The left side is bursa and the right side are spleen
