Booster doses of currently available Covid-19 vaccines work against the Omicron variant of the coronavirus and there appears to be no need for variant-specific boosters, top US infectious disease expert Anthony Fauci said on Wednesday.

"Our booster vaccine regimens work against Omicron. At this point, there is no need for a variant-specific booster," Fauci told reporters at a White House briefing.

He said the...