Explore the complex and remarkable immune system and its vital role in the defense of our bodies.

This program describes certain malfunctions of the immune system, including allergic responses and autoimmune disorders, and introduces the concept of rejection. It explains how HIV (the virus that causes AIDS) is able to overpower the immune system so that it can no longer protect the body from disease.

Doing Its Part stresses the importance of basic good hygiene and preventive health practices in avoiding exposure to harmful germs and in maintaining a healthy immune system.