diseases and immunity

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Across
  1. 2. poisonous or not pure
  2. 9. two things are different but together form a useful combination
  3. 10. the entry of a pathogen into the body of a host
  4. 11. a chemical that damage cells
  5. 12. the movement of a pathogen from one host to another
  6. 13. people keep themselves or their environment clean to prevent diseases
Down
  1. 1. a microorganism that causes disease
  2. 3. feature that you experience when you have a disease
  3. 4. to know someone or something because you have seen or experienced it before
  4. 5. a dead or weakened pathogen that is injected into the body to induce an immune response
  5. 6. a chemical that is recognised by the body as being"foreign"
  6. 7. an organism in which a pathogen lives and reproduces
  7. 8. a protein with a particular shape which helps to kill pathogens