Fighting Disease with Disease

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Across
  1. 3. spread to everyone
  2. 4. treat
  3. 5. proven idea
  4. 6. covid-19
  5. 8. period time
  6. 9. viruses and inactivate
  7. 12. bacteria
Down
  1. 1. a way doing things
  2. 2. fight/proteet
  3. 7. hard difficult
  4. 10. 100 years
  5. 11. ilness