Pfizer: 3 COVID shots protect children under 5

Pfizer says three small doses of its COVID-19 vaccine protect kids under 5. The company released preliminary results on Monday and said it plans to give the data to U.S. regulators later this week. It's the latest step toward letting the littlest kids get the shots. The 18 million tots under 5 are the only group in the U.S. not yet eligible for COVID-19 vaccination. The Food and Drug Administration has begun evaluating data from rival Moderna. That company hopes to offer two kid-sized shots by summer. The FDA has set tentative dates next month for its scientific advisers to publicly debate data from Pfizer and Moderna.

2nd COVID vaccine booster benefits the most vulnerable

The World Health Organization — the U.N.'s health agency — said evidence is limited but is increasing that a second booster dose of COVID-19 vaccine would benefit health workers, people who are 60 or older, and those with weak immune systems.

COVID vaccine: Moderna looks to update shots for fall

Moderna hopes to offer updated COVID-19 boosters in the fall that combine the original vaccine with protection against the latest variant. Before omicron struck, Moderna began testing a shot combining the original vaccine with protection against an earlier variant named beta.