Medical term.

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Across
  1. 1. PCP
  2. 4. improper response
  3. 5. acute viral
  4. 7. study of immune system
  5. 8. white blood cells
  6. 11. blockage
  7. 13. exaggerated reaction
  8. 15. disease caused by body
  9. 16. prevention of disease
  10. 17. extreme sensitivity
  11. 18. severe itching
  12. 20. tissue response
Down
  1. 2. protein
  2. 3. weak pathogen
  3. 6. partial suppression
  4. 9. blood condition
  5. 10. physician
  6. 12. medication
  7. 14. cancer of cells
  8. 19. protein released