The<unk> ,<unk>  T-cell<unk>  virus, or<unk>  T-cell leukemia-lymphoma virus <unk>  family of viruses are a group of<unk>  retroviruses that are known to cause a type of cancer called adult T-cell leukemia/lymphoma and a demyelinating disease called<unk> -1 associated myelopathy/tropical spastic paraparesis (HAM/TSP). The<unk> s belong to a larger group of primate T-lymphotropic viruses (PTLVs). Members of this family that infect<unk> s are called<unk> s, and the ones that infect Old World monkeys are called Simian T-lymphotropic viruses (STLVs). To date, four types of<unk> s <unk> -1,<unk> -2,<unk> -3, and<unk> -4) and four types of STLVs (STLV-1, STLV-2, STLV-3, and STLV-5) have been identified.<unk>  types<unk> -1 and<unk> -2 viruses are the first retroviruses discovered. Both belong to the oncovirus subfamily of retroviruses and can transform<unk>  lymphocytes so that they are self-sustaining in vitro. The<unk> s are believed to originate from interspecies transmission of STLVs. The<unk> -1 genome is diploid, composed of two copies of a single-stranded RNA virus whose genome is copied into a double-stranded DNA form that integrates into the host cell genome, at which point the virus is referred to as a provirus. A closely related virus is bovine leukemia virus BLV. The original name for HIV, the virus that causes AIDS, was<unk> -3.
Human T-lymphotropic virus
Kaposi's sarcoma-associated herpesvirus
Oncolytic adenovirus
Trichodysplasia spinulosa polyomavirus
Oncovirus
Human betaherpesvirus 7
Human betaherpesvirus 5
Xenotropic murine leukemia virus–related virus