Fighting Disease with Disease

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Across
  1. 1. Treat
  2. 3. Bacteria
  3. 6. Protect human from virus
  4. 8. Help to prevent someone from getting a disease
  5. 10. Sickness; Illness
  6. 11. 100 years
  7. 12. Period of time
Down
  1. 2. Many people are sick at the same time
  2. 4. Hypothesis; not proven ideas
  3. 5. Causes the common cold
  4. 7. A way of doing something
  5. 9. Difficulty to do