Infection with the hepatitis G virus (HGV), as indicated by the presen
ce of HGV ribonucleic acid, was sought in 57 children with chronic hep
atitis C virus infection. HGV infection was found in 2 children (3.5%)
, or 14% of the babies whose mothers were former drug abusers. Materna
l drug abuse is an important risk factor for hepatitis G and C virus c
oinfection in children in our area.