Fighting Disease with Disease

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Across
  1. 2. Covid-19
  2. 5. something hard
  3. 6. way to do something
  4. 7. bactereia
  5. 10. Medicine
  6. 11. illness
  7. 12. 1700-1799
Down
  1. 1. immune response
  2. 3. when virus spreads
  3. 4. Injection
  4. 8. time period
  5. 9. not proven