The Mail on Sunday

HOW THE VACCINE WORKS

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The Pfizer jab is a ‘messenger RNA’ (mRNA) vaccine, invented by scientists using the genetic sequence of the SARS-Cov-2 virus. They created short strips of a synthetic molecule which give cells instructio­ns to make the unique ‘spike’ protein found on the virus’s surface. The mRNA strips, packaged in minuscule fat droplets, instruct our bodies’ cells to manufactur­e the protein - triggering an immune response.

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