Pfizer plans to ask the FDA to authorize a third booster shot for vaccine recipients.
President Biden has proposed extending the measure but it's not clear if Congress will support the move.
Fully vaccinated people are at low risk to spread the virus to someone else, researchers said.
The new top 39.6% tax bracket proposed in Biden's plan would encompass less than 1% of taxpayers.
The Biden administration is shifting its public focus from increasing vaccine supplies to persuading people to get shots.
The CDC's alarm comes as nearly 150 million vaccination shots have been given to Americans.
President Joe Biden told states he wants all adults in the U.S. made eligible for vaccines by May 1.
The CDC estimated that just 10% of the population has been fully vaccinated so far.
Two million doses will be delivered to pharmacies this week, up from 1 million.
Most American adults won’t get the vaccine probably until late summer, health officials said.
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