The CDC recommends booster immunizations against Omicron for Americans aged 12 and older.

According to a statement made on Thursday by the Centers for Disease Control and Prevention, the majority of the country's COVID-19 booster doses will be replaced by modernised versions that focus on the predominant Omicron strains and streamline the nation's continuing immunisation campaign.

The reformulated boosters, which are designed to combat the BA.4 and BA.5 subvariants in addition to the original coronavirus that entered the U.S., will be required of Americans ages 12 and up under the new strategy.

If it has been at least two months since the person's last dose, they will be eligible for the new shots.

Currently, around 209 million Americans fit that description; the majority of them haven't had a shot in more than six months.

The Advisory Committee on Immunization Practices, a powerful body of vaccination specialists that advises the CDC, proposed the modification on Thursday.

For individuals 12 and older, the original boosters that don't target BA.4 and BA.5 won't be available any longer.

The bivalent vaccine is the focus of a fall booster campaign that is being promoted by President Biden and members of his COVID-19 reaction team.