The Biden administration has authorized reformulated COVID-19 booster shots for children as young as 5 years old. On Wednesday, CDC Director Dr. Rochelle Walensky approved emergency use of the vaccines produced by Pfizer-BioNTech and Moderna, just hours after the Food and Drug Administration authorized them. Only about 4% of eligible U.S. adults have received updated, bivalent booster shots, which are meant to protect against two Omicron subvariants that currently make up most U.S. coronavirus infections. COVID-19 continues to kill nearly 400 people a day across the United States.