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Illustration of a person being vaccinated against Covid-19. An injection has stimulated the production of different antibodies against proteins (blue) on the SARS-CoV-2 virus that causes Covid-19. The presence of the antibodies mean that the body is primed to attack the virus when it is next encountered, preventing disease. The first vaccine, developed by Pfizer/BioNTech, was approved in the UK on 2nd December 2020.