Washington — Sen. Bill Cassidy, a Louisiana Republican who chairs the Senate Committee on Health, Education, Labor and Pensions, said he's "very concerned" about a potential change to the hepatitis B vaccine schedule for infants, with a key advisory panel set to meet in the coming weeks. "I'm a doctor. I have seen people die from vaccine-preventable disease," Cassidy told "Face the Nation with Margaret Brennan ." "I want to make America healthy, and you don't start by stopping recommendations