"Hepatitis C is the most common blood-borne pathogen in humans and the most common cause of liver failure and reason for liver transplantation in the United States.1 In a large population-based study, 1.8% (3.9 million) of a large household-based sample was positive for anti-hepatitis C virus antibody.2 Of these, 74% (2.7 million) had viremia, an indicator of chronic infection. As many as half of these persons were unaware they were infected.3,4"

Source

Clark EC, Yawn BP, Galliher JM, Temte JL, Hickner J. Hepatitis C identification and management by family physicians. Fam Med. 2005;37(9):644-649.