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The company says its vaccine is 90 per cent effective. What does this really mean and what do we still need to know? Graham Lawton reports.In contrast to his predecessor, US president-elect Joe Biden will use a science-based strategy to tackle the pandemic, says Adam Vaughan.Antibodies in the blood of people who have had covid-19 could be just what we need to tide us over until we have a vaccine, reports Graham Lawton.Many countries are starting new lockdowns, but it may already be too late to stop the second wave of coro
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