The different parts of the immune system and its cell types are explained. Also described are the three kinds of immunity humans have - adaptive, innate and passive - as well as the major types of disorders of the immune system.

The human immune system has various ways of responding to an infection caused by bacteria or viruses. Our bodies produce proteins (antibodies) that are highly specific for the infectious agent as a part of our "humoral" immune response....

In this video segment from The Secret of Life, watch as a virus attacks a cell, and learn how the immune system reacts to this onslaught. Includes background reading material and discussion questions. [1:40]

[Free Registration/Login may be required to access all resource tools.] Discusses immunity and the differences between active and passive immunity.

Antibodies, also called immunoglobulins, are proteins manufactured by the body that help fight against foreign substances called antigens. When antigens enters the body, it stimulates the immune system to produce antibodies. (The immune...

This site from MedicineNet.com gives an in-depth description of mononucleosis, its causes, symptoms, diagnosis and treatment, as well as complications that can come up. Links are provided for easy access to the topics as well to...

Feeling stuffy? Running a fever? Well, read through this article and learn about the different types of germs and what you can do to prevent them. Don't miss the link that includes articles to similar sites.

This virtual laboratory demonstrates how an enzyme-linked immunosorbent assay (ELISA) is carried out and some of the key experimental problems that may be encountered. Students will learn about the assay procedure and the equipment and...