Fighting Disease with Disease

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Across
  1. 3. spread to everyone
  2. 7. fight,protect
  3. 9. treat,heal
  4. 12. hard,difficult
Down
  1. 1. 100 years
  2. 2. something that makes you sick
  3. 4. bacteria
  4. 5. illness
  5. 6. injection
  6. 8. time period
  7. 10. not proven idea
  8. 11. a way of doing things