A<unk>  is a virus, or a viruslike agent, etiologically associated with a<unk>  disease. A<unk>  disease is a disease that, after an extended period of latency, follows a<unk> , progressive course spanning months to years, frequently involves the central nervous system, and in most cases progresses to death. Examples of<unk>  diseases include HIV/AIDS, caused by the HIV virus, subacute sclerosing panencephalitis, the rare result of a measles virus infection, and Paget's disease of bone (osteitis deformans), which may be associated with paramyxoviruses, especially the measles virus and the human respiratory syncytial virus.
Slow virus
Chinese virus
B virus
Limestone Canyon virus
Sepik virus
Pandemrix
Caño Delgadito orthohantavirus
Hendra virus