"One-hundred million Americans were unvaccinated in July, now that's 66 million," Biden said. The president said his goal was to reach those 66 million, a number he called unacceptably high, and he encouraged business owners to use vaccine mandates.

"Every day we see more businesses implementing requirements and see their vaccination rates rise by an average of 20% or more," Biden said.

His comments came as the Food and Drug Administration today begins deliberating use of Moderna and Johnson & Johnson boosters, along with mix-and-match options for the boosters. Currently, only Americans who received the Pfizer-BioNTech vaccine are authorized to receive a booster dose if they are over 65, have underlying health conditions, or work in an environment that puts them at high risk for contracting the virus.

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