The Biden administration on Tuesday announced a new strategy to manage Omicron subvariant BA.5, now responsible for the majority of COVID-19 cases in the U.S.

As part of its strategy, the White House is developing a plan to allow all adults, including those under 50, to receive a second booster shot amid worries of waning immunity among those who were vaccinated and boosted six months ago.

The announcement comes one week after the Biden administration revealed it had signed a $3.2 billion deal with Pfizer for 105 million additional vaccine doses — with an option for 300 million more — to include reformulated bivalent boosters targeting Omicron BA.4 and BA.5 subvariants.

Currently, people age 5 and older are eligible to receive a first COVID-19 vaccine booster dose. A second booster shot is available only to those 50 and older and immunocompromised individuals 12 and older.