The human immune system is perhaps the most complicated system in our bidies. It is composed of organs and chemicals that interact with one another to perform the miracle of defending us against pathogenic invaders.

Our bodies are the perfect breeding ground for pathogenic invaders. Some of these microorganisms can make people sick, some critically ill, and some are so virulent they can even kill their host.

This final program in the three-part Human Immune System series will describe what happens when something goes wrong with the immune system. It will focus on allergies, asthma and other common autoimmune disorders. In addition, it will briefly explain primary and secondary dysfunctions, such as immunoglobulin deficiencies caused by genetic abnormalities as well as the effect certain types of medications have on the immune system.