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Pfizer and Moderna are expected to start producing reformulated doses this summer.
At this point, about 6 million Americans have taken free Paxlovid doses.
The new medication is just one of several antiviral pills now being tested in studies.
More than 30 million Americans already have gotten booster shots.
Molnupiravir could be major advance because it reaches more high-risk patients than the monoclonal antibody treatments now being used.
The updated shot is expected to better target variants that are circulating now and help prevent hospitalization and death from the virus.
The booster shot is recommended for anyone 18 years and older, to be given at least two months after the first dose.
Oral medications patients take when symptoms first appear are being tested, but initial results are not expected for several months.
The strategy will include free tests, extending rules on mask wearing and launching public awareness campaigns.
An expert panel will vote later Tuesday on whether to recommend authorizing the drug for high-risk patients.