Immune System

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Across
  1. 1. very small things that cause infection
  2. 4. Common microscopic organism
  3. 6. used for the treatment or prevention of disease
  4. 10. an increase in body temperature when sick
  5. 11. a dangerous immune response to a safe substance
  6. 12. protein that helps get rid of infection
  7. 13. a sign of the existence of something, especially of sickness
  8. 15. another word for protection
Down
  1. 2. the outer covering of the body
  2. 3. a body system that works to keep the organism healthy
  3. 5. a continuous or prolonged pain
  4. 7. when a virus or microorganism enters the body
  5. 8. not sick
  6. 9. to be sick
  7. 14. a body temperature above the normal; fever.