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is conducting clinical studies to determine if the next COVID booster should be specific to a particular variant of the coronavirus or designed to address more than one variant, known as a bivalent vaccine, ahead of the fall season, he said.

"We likely will know over the summer when we'll be able to, and what we'll be able to, boost people with," Fauci said at a virtual event hosted by the National Press Club in Washington.

Fauci also said health experts are looking carefully into anecdotal reports that some people after taking a five-day course Pfizer Inc's oral antiviral treatment Paxlovid have tested positive for the coronavirus or experienced mild symptoms.

The government has been encouraging people at risk of severe disease who experience COVID symptoms to get a Paxlovid prescription as soon as possible.