As of Tuesday, the US Food and Drug Administration (FDA) issued a statement saying it had approved 10 of Moderna's updated booster vaccines.

The US has shipped 25 million modified COVID-19 vaccines, mostly from Pfizer/BioNTech, and Moderna's vaccine production continues to rise, the FDA said.

Also, the Food and Drug Administration (FDA) said it had approved ten batches of Moderna's updated vaccine, made at a Catalent facility in Indiana, after it deemed them safe to use.

Both CVS and Walgreens said they are working with the government to get more Moderna doses and have seen no supply issues for the Pfizer/BioNTech booster.

An ASPR spokesman told Reuters

"We expect supply to continue to rise in the coming weeks,"

The U.S. has ordered more than 170 million booster shots of the updated vaccine this fall, when all people age 12 and older are encouraged to get a booster shot when they've already received the initial dose of the vaccine.