Immunity

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Across
  1. 5. a large white blood cell
  2. 6. a type of phagocyte
  3. 7. second stage of infection
  4. 9. modes include water, air and animal carriers
  5. 10. first line of defence in the nose
  6. 11. the third line of defence is ... immunity
  7. 12. a T cell that kills the body's own cells if they are infected with a virus
  8. 15. the system that B and T cells circulate through
  9. 17. the marker on the surface of a virus (spike)
Down
  1. 1. acid in the stomach
  2. 2. phagocytes target invading cells ...
  3. 3. some B cells become ... cells
  4. 4. third stage of infection
  5. 8. present on the surface of B cells (Y shaped)
  6. 12. small hairs in the trachea
  7. 13. first line of defence in the eyes
  8. 14. first stage of infection
  9. 16. the T cell that helps B cells make antibodies