Probably the first thing you ask for when you're sick is a pill to make you feel better. Typically you don't care how the pill works as long as it does work.
Physicians have an arsenal of substances that combat disease. These substances are chemical agents called drugs and taking drugs to cure a disease is called chemotherapy. Throughout this book you learned about pathogenic microorganisms that are harmful when they invade a body. However, there are some microorganisms that actually prevent the harmful effect of pathogenic microorganisms.
A microorganism that destroys a pathogenic microorganism and used to cure a disease is referred to as an antimicrobial drug. You'll learn about antimicrobial drugs in this chapter.
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