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Mass testing is being touted as a way of getting us much closer to a normal life and even of avoiding lockdowns in the future.

Testing everyone – even those without symptoms – can be an incredibly powerful tool for rooting out the virus.

Boris Johnson has promised a “massive expansion” in such testing in the UK and Liverpool is the first city to trial it.

But questions have been asked about the current tests and the overall strategy. So, what can mass testing realistically achieve?

Sir John Bell, from the University of Oxford, is the government’s adviser on life sciences and he says it “may well

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