Infectious disease and immunology

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Across
  1. 3. Disease caused by the invasion of a pathogen
  2. 6. Passing of an infectious disease
  3. 8. Second line of defence ... response
  4. 11. A foreign substance that invades the body
  5. 13. A self marker
  6. 15. Phagocyte that 'eats' pathogens and can trigger the third line of defence
  7. 16. Cells that remember specific antigens
  8. 18. Disease caused by genetic or lifestyle
  9. 19. Biological agents that produce disease
Down
  1. 1. Small white blood cells involved in the third line of defence
  2. 2. B-lymphocytes that produce antibodies
  3. 4. Third line of defence ... immune response
  4. 5. Proteins that combine to neutralise antigens on invading pathogens and their toxins
  5. 7. Factors that allow pathogens to enter cells
  6. 9. First line of defence ... immune response
  7. 10. Ability of a pathogen to cause a disease
  8. 11. Factors that allow a pathogen to bind and maintain attachment to a host cell
  9. 12. T-lymphocytes that destroy infected cells (also called killer T cells)
  10. 14. Organism in which the pathogen lives
  11. 17. T-lymphocytes that begin the cell-mediated response