key words

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Across
  1. 5. the romans built these to transport water
  2. 6. used to stimulate the the production of antibodies and provide immunity against a disease
  3. 7. a substance that slows down the growth of microorganisms
  4. 8. protected against, not affected by that disease
  5. 10. to give a weak form of a disease to a person or animal, usually by injection, as a protection against that disease
  6. 12. an organism that can only be seen through a microscope
Down
  1. 1. heating liquids or food to kill bacteria
  2. 2. an unpleasant smell or vapour
  3. 3. medicines that treat infects by killing bacteria
  4. 4. black bile, yellow bile, blood and phlegm
  5. 9. x-ray that provides a cress section of the human body
  6. 11. a heart monitor