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$British Prime Minister Boris Johnson visits Stow Health Vaccination center, in Westminster, London. Johnson says that Britain faces a \tidal wave\ of infections from the omicron coronavirus variant and he has announced a huge increase in booster vaccinations to strengthen defenses against it. (Jeremy Selwyn/Pool Photo via AP)$ World

Unprecedented Omicron spread, 'probably' in most countries: WHO

Omicron now accounts for around 3 percent of cases in the US, a figure that is expected to rise rapidly as has been seen...

15 Dec 2021 10:39 AM IST