Hepatitis G is transmitted by blood-borne routes and was just discovered in 1995. Risk groups include intravenous drug users, hemodialysis patients, and transfusion recipients. Acute infection is diagnosed by antibody tests or by molecular techniques like PCR that detect the presence of RNA from the virus.
People can remain infected for many years. The first major study of virus has reported that those infected by means other than blood transfusions did not develop chronic liver disease. Because it was only identified recently, it isn't clear at this time how widespread hepatitis G is and what its precise effects are on infected patients.