Across
- 1. free from dirt, marks, or stains
- 3. bacterium that occurs mainly in the intestine
- 6. microscopic organism
- 8. large domain of prokaryotic microorganisms
- 9. a bacterium commonly found in the intestines of humans and other animals, where it usually causes no harm
Down
- 1. the state of being contaminated
- 2. the action of washing oneself
- 4. an antigenic poison or venom of plant or animal origin
- 5. food poisoning caused by improperly sterilized canned meats and other preserved foods.
- 7. conditions relating to public health