13. opportunistic infection: Infections that occur when the body's defenses are
weakened
14. bacteria: one-celled microorganisms, some of which are beneficial and some of
which cause disease (tuberculosis, pertussis, strep throat)
15. protozoa: These are one-celled animal-like organisms often found in decayed
materials animal or bird feces, insect bites and contaminated water, pathogenic and
cause diseases such as malaria and aftrican sleeping sickness
16. fungi: These are simple, plant-like organisms that live on dead organic matter.
Yeast and mold are two common forms that can be pathogenic. They cause diseases such
as ringworm, athletes foot and thrush
17. rickettsiae: These are parasitic microorganisms, which means they cannot live
outside the cells of another living organism . They are found in fleas , lice, ticks and
mites.
18. viruses: These are the smallest microorganisms, visible only using an electron
microscope.
They cannot reproduce unless they are inside another living cell. They are spread by
blood and body secretions.
They are difficult to kill by disinfectants and they are not affected by antibiotics. They
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