Fighting Disease with Disease

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Across
  1. 3. penetration of viruses and bacteria
  2. 8. Guesses are based on facts, not on action.
  3. 10. system organs and processes of the body that provide resistance to infection
  4. 11. difficulty
  5. 12. It's a disease that is contagious.
Down
  1. 1. This medicine is given before the virus to prevent infection.
  2. 2. 100 years
  3. 4. Guesses are based on facts, not on action.
  4. 5. sudden increase in morbidity
  5. 6. this is a way of treatment
  6. 7. treat, medicine
  7. 9. a distinct period of time