Hepatitis C affects 3.5 million Americans, and the Cherokee Nation, one of the largest Native American tribes in the U.S., is trying to eliminate the virus among its population. In partnership with the University of Oklahoma, the Oklahoma Department of Health, and the Centers for Disease Control and Prevention, the tribe has undertaken an ambitious effort to screen all 300,000 of its members -- whose infection rate is five times the national rate -- and treat them with new drugs that have proven 90 percent effective. On Sunday, NewsHour's Stephen Fee reports on how the study may contribute to stopping the disease in the broader population.