Across

1. An often poisonous, mushroom shaped fungus.
5. A method of stimulating resistance to diseases in the human body using microbes.
6. A clear shallow container for growing bacteria(5,4).
8. A disease that spreads rapidly through a population.
9. Increased resistance to a particular disease.
11. Tiny, microscopic life form.
14. A solid yellow food made from milk.
15. To inject a weakened form of a disease so as to create immunity to the disease.
16. Single celled fungi important for their ability to ferment carbohydrates.
17. A famous antibiotic discovered by Alexander Fleming.

Down

2. A nutrient jelly for growing bacteria.
3. A simple organism that can only reproduce within a living plant or animal cell. They often cause disease.
4. A chemical that kills bacteria.
7. An organism that causes disease.
10. Primitive single celled organisms
12. Tiny, microscopic organism usually a type of bacteria.
13. A simple plant that lacks green chlorophyll. Athlete's foot is caused by one of these.
14. A mass of bacteria growing in a Petri dish.