1. Invisible to the naked eye, requiring a microscope to see

2. The invasion and multiplication of microorganisms in a host

2. The ability of an organism to resist infection

3. Serving to protect against infection or disease

4. Singular form of bacteria

5. Substance used to kill or inhibit the growth of microorganisms

6. Having the ability to withstand the effects of a microbe

7. Poisonous substance produced by a living organism

8. Fungus that grows in the form of multicellular filaments

9. Severe and often deadly infectious disease caused by bacteria

10. To clean or sterilize to destroy microorganisms

11. Infectious agents that replicate inside living cells

12. Generic term for microscopic organisms

13. Substance that kills or inhibits the growth of all microorganisms

14. Practices that help maintain health and prevent disease