The Breastfeeding Answer Book, page 460, gives references as recent as 1996:
"According to the medical literature to date, the incidence of hepatitis C
infection in breastfed infants is the same as that in artificially fed infants
born to hepatitis C carrier mothers (Gartner 1996)" There are several other
studies mentioned including one that could be interpreted as "1 in 7" babies
acquired the virus thru breastfeeding- and I noted that it was 1 in a study of
7 infants, not 100 out of 700 or 1000 out of 7000.
Lisa Jones, LLLL in Wellington FL