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Across 3. harmful organisms that produce disease 6. the science that deals with the study of microorganisms 8. pathogenic organisms that require living matter for their growth 11. short rod-shaped organisms 13. bloodstream carries the bacteria and their toxins to all parts of the body 14. a virus that is transmitted through unprotected sex and sharing needles 16. nonpathogenic bacteria that lives on dead matter and does not produce disease 18. curved or corkscrew shaped organisms

Down 1. living organisms so small that they can pass through the pores of a porcelain filter 2. the ability of the body to destroy bacteria that have gained entrance, and resist infection 4. type of immunity that the body develops after it has overcome a disease 5. harmless bacteria 7. a person who is personally immune to a disease yet can transmit germs to others 9. pus forming organisms that grow in bunches or clusters 10. one-celled microorganisms 12. hairlike projections 15. round shaped organisms 17. the virus that causes aids