The news this week that the Pfizer/BioNTech Covid-19 vaccine protected more than 90% of recipients in trials is of huge importance. The efficacy is significantly higher than hoped for and thus far there appear to be no safety concerns.

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The Guardian's health editor Sarah Boseley explains that while this is a major breakthrough there are still several hurdles that need to be outcome and why restrictions such as wearing masks, social distancing and remote working must remain for the time being

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