U.S. President-elect Joe Biden announces nominees and appointees to serve on his health and coronavirus response teams as Dr. Rochelle Walensky, U.S. President-elect Joe Biden's appointee to run the U.S. Centers for Disease Control and Prevention (CDC), and Vice President-elect Kamala Harris listen during a news conference at his transition headquarters in Wilmington, Delaware, U.S., December 8, 2020. REUTERS/Kevin Lamarque