A<unk> , also termed a gutless virus, is a synthetic viral vector<unk>  on the assistance of a<unk>  virus in order to replicate, and can be used for purposes such as gene therapy. Naturally-occurring satellite viruses are also<unk>  virus<unk> , and can sometimes be modified to become viral vectors.
Helper dependent virus
Intracellular parasite
Human parasite
Oncolytic virus
Human pathogen
Flavivirus
Lentivirus
Henipavirus