| 英文描述 | Viruses of the leukosis/sarcoma (L/S) group induce in chickens (and to a lesser extend other avian species) a variety of transmissible benign and malignant neoplasms. The type of neoplasm induced is influenced by several factors; the virus' exposure dose and route; strain, age, and sex of the bird. The most common type in chickens is lymphoid leukosis, a neoplasm of the bursa- dependant lymphoid system. Less common tumors are erythroblastosis, myeloblas- tosis, myelocytomatosis, nephroblastoma, osteopetrosis, hemangioma, and sarcomas. |
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