A<unk>  also termed a gutless virus is a synthetic viral vector<unk>  on the assistance of a<unk>  virus in order to replicate.
Since the genome of the gutless virus does not include genes encoding the enzymes required to replicate, it is deemed safe for use in gene therapy since an infection cannot occur except in the presence of a suitable<unk>  virus.
Helper dependent virus
RNA virus
Oncolytic virus
Marnavirus
Benyvirus
Aerobic organism
Endornavirus
Arenavirus