Summary
Japanese haemophiliacs have been at high risk for infection with parenterally-transmissible
viruses through the use of blood products, especially imported ones. Recently, novel
transfusion-transmissible virus, GB virus C (GBV-C)/hepatitis G virus (HGV) were isolated.
We investigated the origin and route of transmission of GBV-C/HGV isolates in haemophiliacs
in Japan. GBV-C/HGV RNA was measured by nested reverse transcription polymerase chain
reaction in 91 Japanese haemophiliacs. Phylogenetic analysis and genotypic grouping
of GBV-C/HGV isolates in Japanese haemophiliacs were performed based on sequences
in the 5’ untranslated region, and the characteristics were compared with those of
reported isolates. GBV-C/HGV infection was present in 19 of 91 haemophiliacs (20.9%).
Sequence analysis showed that 15 of the 19 isolates (78.9%) showed sequence similarity
to a group in which mainly West African isolates have been reported. The other 4 isolates
(21.1%) showed sequence similarity to Asian isolates. None of the GBV-C/HGV isolates
showed sequences similar to those generally found in isolates from USA and Europe.
The majority of GBV-C/HGV isolates found in Japanese haemophiliacs who are considered
to have been infected by imported blood products were similar to those detected in
West Africa.