For a short and sweet review on the hepatitis viruses see Robert Purcell's
"Hepatitis viruses: Changing patterns of human disease." In Proc. Natl. Acad.
Sci. 1994. 91:2401-2406.
In it HCV is described as showing a sero-prevalence of .3% in adult blood donors
and approximately 1% in developed countries. Greater than 50% of the acute
HCV cases progress to chronic infection.