COVID-19 vaccine development part 3

 How vaccines are delivered?

  • A vaccine can be administered through different routes, for example injection in the muscle or under skin or via the oral route
  • Vaccines sometimes require more than one dose to:
  1. build complete immunity
  2. give a “booster” dose when immunity wears off
  3. immunize people against viruses causing disease that may be different from season to season, for example, the yearly flu vaccine

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