Carla K. Johnson | Associated Press
Melanoma, pancreatic cancer, breast cancer and lung cancer are among the targets for the experimental shots, which shrink tumors and stop cancer from coming back.
U.S. officials say most Americans live in places where healthy people can safely take a break from wearing masks.
Last year’s flu season was the lowest on record. That's likely because COVID-19 measures — such as schools closing and people wearing masks — prevented the spread of influenza.