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Covid: Johnson & Johnson single shot Janssen vaccine shown to work, but not as well as some two-shot rivals

play-icon Video report by ITV News Science Editor Tom Clarke Johnson & Johnson s one-dose coronavirusvaccine - which the UK has ordered 30 million doses of - has been shown to protect against Covid-19, but not as well as some two-shot rivals, trials have shown. The single-shot Janssen vaccine was found to be 66% effective overall at preventing moderate to severe illness, and much more protective 85% against the most serious symptoms. play-icon Professor Peter Openshaw from Imperial College London: It s extraordinary news isn t it? It s such a success for the vaccine development field as a whole and to see this announcement that the Johnson & Johnson vaccine - which is on the list of those that have been procured by the UK vaccine taskforce - also looks so effective is wonderful.

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