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Kate Bingham, the former head of the UK's Covid-19 Vaccine Taskforce who secured millions of doses for the country, said scientists should know within a week whether existing shots are effective against the Omicron variant of the coronavirus. Bingham, a venture capitalist who backed multiple vaccines at the start of the pandemic to secure early access for Britain, said she currently expected that the leading shots would still show efficacy. "The question is do they have the same level of efficacy?" she said on Wednesday. Bingham, who has returned to her role as managing partner at SV Health Investors, said Britain had built up the capability to quickly test existing vaccines against new variants. "It's not something you can do overnight, but we will get data, I would have thought within a week as to whether or not the vaccines work or don't," she said.

Britain will offer a Covid-19 booster shot to all adults and could halve the dose interval for booster jabs from six to three months in a bid to accelerate its vaccination programme amid concern over the new Omicron coronavirus variant, as number of new cases found in the country rise. The move, backed by a scientific advisory body and Health Secretary Sajid Javid, comes as ministers scramble to react swiftly to the new variant, which was first detected in South Africa. Prime minister Boris Johnson has responded to the emergence of Omicron by making mask-wearing compulsory in shops and on public transport in England. Until now, only adults in the UK aged 40 and above were eligible for a booster dose six months after their last. But that timeframe will now be halved to three months, alongside the programme's expansion to all over-18s, with priority given to older people. "These measures will protect more people, more quickly and make us better protected as a nation," Javid told MPs.