Hepatitis G virus (HGV) is a recently described flavivirus present in
1-2% of blood donors. It is transmitted parenterally and is found at h
igh frequency in patients receiving multiple blood products, haemodial
ysis patients and injecting drug users. Acute infection causes a mild
hepatitis in a minority of patients. Many subjects remain persistently
infected, but there is little evidence to date that chronic HGV infec
tion causes hepatic or other disease. At present polymerase chain reac
tion-based techniques are used for diagnosis, although serological tes
ts are being developed. Currently, there is little evidence to suggest
that screening of blood donors for HGV infection should be carried ou
t. (C) 1998 Lippincott Williams & Wilkins.