Jennifer & Bill

Watch: CDC Director Makes Some Big Claims – This Could Be a Game Changer

Virus Outbreak Tweaking Vaccines
David Williams receives a COVID-19 vaccine at the Martin Luther King Senior Center, Wednesday, Feb. 10, 2021, in North Las Vegas. The makers of COVID-19 vaccines are figuring out how to tweak their recipes against worrisome virus mutations — if and when the shots need an update. (AP Photo/John Locher, File)