Transcript: NIH Director Dr. Francis Collins on "Face the Nation," December 19, 2021

The following is a transcript of an interview with Dr. Francis Collins, director of the National Institutes of Health, that aired Sunday, December 19, 2021, on "Face the Nation."

MARGARET BRENNAN: We go now to the director of the National Institutes of Health, Dr. Francis Collins. Good morning. And before we begin, Doctor, I want to note that this is your last day as director. You're not retiring, but you are stepping aside from NIH, so thank you for your service to the country.