> Hepatitis G virus (HGV) is a distant relative of the hepatitis C virus.HGV, also called    hepatitis GB virus. It was discovered in the mid 1990s at the same time as GBV-C and    they are believed to be different strains of the same virus. Sometimes this is written    as HGV/GBV-C.
> It causes Hepatitis G, which is a newly discovered form of liver inflammation.

Virology-
> GB virus C (GBV-C or hepatitis G virus) is a recently described flavivirus. Like other    members of the Flaviviridae, GBV-C is a positive-strand RNA virus. Viral RNA encodes    a single long open reading frame (ORF). The GBV-C polyprotein is predicted to be    cleaved into two envelope proteins (E1 and E2), an RNA helicase, a trypsin-like serine    protease, and an RNA-dependent RNA polymerase.
> Other informations are unknown for this virus like replication, functioning of viral    protein etc. Scientist are trying to disclose these informations.