Hepatitis G: This was discovered in 1996, not much people knows about it because it is a new strain of hepatitis. It can be transmitted via blood and is most commonly seen in IV drug users. Hepatitis G usually does not show any clinical symptoms.
Individuals with clotting disorders such as hemophilia, and individuals who require hemodialysis for renal failure.
HGV is a positive sense, single stranded RNA virus transmitted by blood transfusion. This can cause chronic hepatitis leading to cirrhosis, and long term carriers exist. Screenings of blood for HGV makes blood transfusion still faster.
People that has hepatitis B or C are often infected at the same time with hepatitis G. There is some indication that patients with hepatitis G may continue to carry the virus in their blood for many years, and so might be a source of infection in others.