The FDA is said to be ready to approve Pfizer and Moderna boosters at once

But after Moderna filed a similar request Wednesday, officials began discussing whether to speed up that permit as well, people with knowledge of the case said.

The FDA declined to comment.

Moderna reported earlier this summer that its booster is 93 percent effective when given six months after the second dose, and the company has been in close contact with the FDA since then about a possible approval of its shots for all adults.

With Covid-19 cases rising more than 20 percent in the U.S. over the past two weeks, some administration officials also argued that clearing the shot before Thanksgiving would allow all adults to quickly seek a booster, no matter what vaccine they originally received.

The FDA is now expected to finalize the approval of both vaccines Friday morning ahead of an afternoon meeting of the Centers for Disease Control and Prevention’s vaccine advisory panel, according to people with knowledge of the case.

It is still unclear how the CDC panel will react to the rapid approval of Moderna’s booster shots. The external advisers – who are accused of recommending who should receive the vaccines – were originally planned only to consider extended eligibility for Pfizer’s booster. FDA action may raise concerns among some advisers that they will be asked to approve the distribution of another vaccine at a faster pace than they had originally planned.

The CDC is not required to follow the panel’s advice on how vaccines should be rolled out, but it has traditionally followed its recommendations.

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