By a reverse transcriptase-polymerase chain reaction assay, we studied
the risk of hepatitis G virus vertical infection in seven infants bor
n to women positive for hepatitis G virus ribonucleic acid and hepatit
is C virus antibody. Of these, three (42.9%) tested positive for hepat
itis G virus ribonucleic acid and two (28.6%) had a carrier state. Int
rauterine or birth canal infection seemed much more significant than t
he infection by breast-feeding.