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The difference between COVID vaccines’ ‘efficacy’ and ‘effectiveness’ explained

Jonathan Gornall|-The development of anti-COVID vaccines has forced countries to make swift decisions about which ones to go for – choices that are based more on availability than absolute knowledge of their efficacy.But now concerns are being raised that some of these potential life-savers might not be as effective as we have been led to expect. As more details emerge of the research findings behind several of the new coronavirus vaccines,the suspicion is dawning that those choices are creating a lottery in which there might be winners and losers.
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