The Vaccination Crossword

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Across
  1. 3. Is a Viral Vector Vaccine
  2. 4. Is an Mrna Vaccine
  3. 5. Are triggered by our bodies in response to viralp proteins
  4. 6. This protein is found only on the surface of Covid-19
Down
  1. 1. Herd immunity protects by restricting the ___ of disease
  2. 2. The percentage of --- at which herd immunity is achieved is called 'Herd Immunity Threshold'