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