<unk>  <unk>  is a human, single-stranded RNA retrovirus that causes T-cell leukemia and T-cell lymphoma in adults and may also be involved in certain demyelinating diseases, including tropical spastic paraparesis. Adult T-lymphotropic virus (ATLV) is a strain of this disease that affects primarily adults. A closely related virus is bovine leukemia virus BLV.
Human T-lymphotropic virus
Human Immunodeficiency Virus 
Human papillomavirus
Oncolytic virus
Epstein Barr virus
Bovine coronavirus
Cytomegalovirus
Hepatitis B virus