Can we trust a coronavirus vaccine?

It has been an exciting few weeks. First Pfizer announced a 90 per cent efficacy of its vaccine candidate, then Moderna one-upped it with 94 per cent. Then, in the early hours of Monday morning, November 23, the Oxford vaccine was shown to have 70 per cent effectiveness – increasing to 90 if people were given an initial half dose followed by a booster. The Oxford vaccine also has the advantage of being by far the cheapest and easiest to store of the three.

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