Chapter 10

6. Viruses that infect and kill bacteria, sometimes used as alternative treatments.
9. The lowest concentration of an antimicrobial drug that prevents visible microbial growth.
12. Toxicity The ability of a drug to kill microbes without harming the host.
13. Drugs that are chemically modified in the lab after being derived from natural sources.
14. Substances produced by microorganisms that inhibit or destroy bacteria.
15. Antimicrobials that are effective against a limited group of microbes.

1. The ratio comparing a drug’s toxic dose to its effective dose, indicating safety.
2. The use of drugs to treat and control microbial infections.
3. A broad term for drugs that act against microorganisms.
4. The use of a drug to prevent infection in someone at risk.
5. Drugs that are produced entirely through chemical reactions in the laboratory.
7. The clear area around an antibiotic disk where bacterial growth is prevented.
8. Resistance The ability of microbes to withstand the effects of drugs that previously inhibited them.
10. A method used to determine bacterial susceptibility to antibiotics using zones of inhibition.
11. Antimicrobials that are effective against a wide variety of microbes.