08:06WeekendWHO: Omicron could become dominant strain of Covid-19BBC World Service Duration: 23 minutes Sat 4th Dec 2021, 08:06 on BBC World Service OnlineAvailable for yearsListen nowEarly data suggests Omicron may evade some immunity to Covid-19 Show more GenresNewsFormatsMagazines & ReviewsBrandWeekend Source: BBC Online