immune system

Presents an introduction to immune system, explaining what it is, how it works, and its function in the human body; looks at some of the illnesses and injuries that can affect the immune system; and offers advice on how to keep the immune system healthy.

Discusses the workings of the body's immune defense system; what happens when this system functions perfectly, too vigorously, or not at all; and current research in immunology.

Provides information about germs, explaining how and why people get sick and how the body defends itself against bacteria and viruses, and including stories of germ encounters throughout history, as well as a selection of experiments.