Hepatitis C affects approximately 4 million or 2% of Americans, and more than 100 million persons worldwide. Chronic hepatitis C can progress to cirrhosis and liver cancer. Endstage liver disease and liver cancer due to hepatitis C account for 30%-50% of adult liver transplantations in western countries. Most people with chronic hepatitis C do not have symptoms and are not diagnosed until they have advanced liver disease. There is as yet no vaccine for hepatitis C.
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