| retroviruses type b, mammalian | A genus of the family retroviridae consisting of a few exogenous, vertically transmitted and endogenous viruses of mice. It is associated with mammary carcinoma and T-cell lymphoma. (12 Dec 1998) |
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| retroviruses type c, avian | A genus of the family retroviridae with type c morphology, that causes malignant and other diseases in wild birds and domestic fowl. (12 Dec 1998) |
| retroviruses type c, mammalian | A genus of retroviridae comprising endogenous sequences in mammals, related reticuloendotheliosis viruses of birds, and a reptilian species. Many species contain oncogenes and cause leukaemias and sarcomas. (12 Dec 1998) |
| retroviruses type d, simian | Type d retroviruses that cause simian acquired immunodeficiency syndrome (saids) and malignancies in monkeys. at least five serotypes of srv are recognised: srv-1, srv-2 (retrovirus-d/new england), srv-3 (mason-pfiser monkey virus), srv-4, and srv-5. Subcutaneous fibrosarcoma is associated with srv-1 infection and retroperitoneal fibromatosis is associated with srv-2 infection. (12 Dec 1998) |
| retroviruses, simian | Classes of retroviruses for which monkeys or apes are hosts. Those isolated from the west african green monkey and the asian rhesus macaque monkey are of particular interest because of their similarities to viruses causing cancer and acquired immunodeficiency syndrome (aids) in humans. (12 Dec 1998) |
| retroviruses, type d | A genus of the family retroviridae consisting of oncogenic exogenous retroviruses that contain type d particles. They include the type species, mason-pfiser monkey virus, isolated from mammary carcinoma and normal tissues in rhesus monkeys, and several other serotypes of simian type d retroviruses (retroviruses type d, simian), all of which cause simian aids (saids) and other malignancies. The permanent human fibroblast virus (pmfv) is also type d. The core of the type d viruses is the intracytoplasmic type a particle and its mechanism of budding from the cell membrane is similar to the type b oncoviruses. (12 Dec 1998) |