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The news this week that the Pfizer / BioNTech Covid-19 vaccine has been effective on over 90% of the trial recipients is of enormous importance. The effectiveness is significantly higher than hoped and so far there do not appear to be any safety concerns.
Guardian health editor Sarah Boseley explains that while this is an important step forward, there are still several hurdles to overcome and restrictions such as wearing masks, social distancing and remote working must remain in place. for the moment.
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