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Hepatitis C is a liver infection caused by the hepatitis C virus (HCV) that results in acute or chronic presentation. The disease is often asymptomatic, but infected patients may experience fatigue, joint pain, itchy skin or jaundice. There is no effective vaccine against HCV, so the market is driven by therapeutics. Currently, drug combinations containing pegylated interferon (e.g., Roche’s Pegasys and Merck’s PegIntron) and ribavirin (e.g., Roche’s Copegus and Merck’s Rebetol) are used to treat HCV infection.