Fighting disease with disease

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Across
  1. 2. the)late(20's,30's)-
  2. 3. system-cells that fighting with disease
  3. 6. substance used to stimulate immunity to a particular infectious disease or pathogen.
  4. 8. of 100 years.
  5. 9. it can be right and can be wrong.
  6. 10. way to do it.
Down
  1. 1. infection.
  2. 3. invasion and multiplication of microorganisms, such as bacteria, viruses, fungi, or other germs, in a host's body.
  3. 4. long and distinct period of history with a particular feature or characteristic
  4. 5. a)cure-treat
  5. 7. widespread occurrence of an infectious disease in a community at a particular time.