The Omicron variant has emerged on the back of a continuingly high rate of infections of the Delta variant, Prof Chris Whitty, England's chief medical officer, says, APA reports citing BBC.
Although the new variant is not making a big dent in the daily case figures, "the data here is now clear," he says. "Omicron is going up incredibly fast."
He said the aim of the Plan B measures is to "slow things down" - adding Omicron could go from "very small numbers to very large numbers quickly".
Whitty adds that the booster shot campaign will become critical when Omicron "becomes significant and ultimately dominant".
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