Deadly hepatitis C is curable, but 2.5 million Americans remain infected without treatment. Dr. Francis Collins, longtime director of the National Institutes of Health, is now serving as a special advisor to Present Biden for an effort to eliminate hepatitis C in the US. He speaks with Stephanie Desmon about why hepatitis C has been so tricky to diagnose and treat and what it will take to launch a coordinated effort to cure every American living with the disease.