Vaccine advisers to the Centers for Disease Control and Prevention have endorsed the first reformulated versions of the Moderna and Pfizer-BioNTech COVID-19 vaccines. The vote was 13 in favor and one no vote.

The booster shots target both the original strain of the coronavirus and the omicron BA.4 and BA.5 subvariants that most people are catching now. This double-barreled vaccine is called a bivalent vaccine.

The CDC advisors recommended that anyone age 12 and older get the new Pfizer-BioNTech boosters as authorized by the Food and Drug Administration. The updated Moderna COVID-19 vaccine is authorized for anyone 18 and older.

In both cases people would have to wait two months after completing their initial vaccination or their last booster shot. But many vaccine experts say it would be better to wait at least four months since the last shot or COVID infection, or the boosters won't work as well.

This is the first time the FDA has authorized vaccines without requiring they get tested in people. To keep up with the rapidly evolving virus, the FDA relied on how well the shots stimulated the immune systems of mice. They also looked at how well similar shots targeted at earlier variants worked on people.