FILE PHOTO: John Nkengasong, Africa’s Director of the Centers for Disease Control, speaks during an interview with Reuters at the African Union Headquarters in Addis Ababa

FILE PHOTO: John Nkengasong, Africa's Director of the Centers for Disease Control (CDC), speaks during an interview with Reuters at the African Union (AU) Headquarters in Addis Ababa, Ethiopia March 11, 2020. REUTERS/Tiksa Negeri/File Photo