Fighting disease with disease

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Across
  1. 3. Condition of make a person unhealthy
  2. 4. Period of time
  3. 5. protects for sickness, viruses..
  4. 7. Way of doing something
  5. 8. Prevent to sickness
  6. 11. Healing treatment of physical health or brain health
Down
  1. 1. COVID, widespread
  2. 2. 100 years
  3. 4. Spreads very quickly, affects many people
  4. 6. Explain of how or why something happens
  5. 9. Difficult or interesting task that you life
  6. 10. Common cold, flu, and chickenpox