How fast can a vaccine be made?

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Across
  1. 2. Happening at the same time
  2. 4. Strength against illness or disease
  3. 6. Can be done again in the same way
  4. 9. A stage in the development of something
  5. 11. The amount of medicine a person takes
  6. 12. Checked or monitored for quality
  7. 13. To make something happen faster
  8. 15. Strong and healthy
Down
  1. 1. Substance produced by the body to fight infection
  2. 3. Something that changes often
  3. 5. Grown in controlled condition e.g. laboratory
  4. 7. Weak or easily damaged
  5. 8. Official permission by an authority
  6. 10. A micro-organism that causes a disease
  7. 14. The condition of not being affected by something