Fighting disease with disease

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Across
  1. 2. a way to do things
  2. 4. system part of your body that protects you and avoids viruses
  3. 8. st hard that after you complete that, you can achieve sth new, good
  4. 9. little molecules of illness
  5. 10. changes on people on things after years
  6. 11. not proven idea
Down
  1. 1. bacteria attack
  2. 3. another way of illness/sickness
  3. 5. when a disease spreads quickly, and affects many people in one area
  4. 6. came from latin word that means cow
  5. 7. 100 years
  6. 8. a treatment that completely fixes an illness