
Hepatitis-C is a serious liver infection caused by an often lethal virus, and it spreads from one person to another through contact with blood, including blood transfusions and shared needles. Gilead Sciences boasts that its two leading biologic medications have a cure rate of as high as 95 percent, in comparison with 40 percent for older, less advanced treatments. But Sovaldi and Harvoni can cost between $83,000 and $95,000 retail for a full course of treatment.

