Summary

Virus-particle elaboration by budding in microvilli of liver parenchymal cells at the bile canalicular border occurred in birds with extensive hepatic lymphomatosis induced by intravenous inoculation of BAI strain A virus. Canalicular lumen contained virus particles but no buds in chickens with myeloblastic leukemia. Neither buds nor particles were associated with the canaliculi in liver with extensive lymphomatosis following transplantation with nephroblastoma tissue and with small localized lymphoid cell deposits. Budding and canalicular particles seemed related to virus concentration in the invading lymphoid tissue or in the circulating blood plasma in myeloblastosis.

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