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 that have made us substantially healthier."

Cassidy, a physician whose medical practice focused on hepatitis B, noted that because of the recommended hepatitis B vaccine dose at birth, "we have decreased incidence of chronic hepatitis B by 20,000 people over the last two decades."

"The vaccine

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