Understanding the Immune System

The U.S. Department of Health and Human Services National Institute of Allergy and Infectious Disease has compiled a publication entitled: Understanding the Immune System - How It Works

This publication, 43 pages in all, is well worth the time to read and study so that you can truly understand the complexity of your immune system.

Excerpt from "Understanding the Immune System", page 1:
The immune system is amazingly complex. It can recognize and remember millions of different enemies, and it can produce secretions (release of fluids) and cells to match up with and wipe out nearly all of them.
The secret to its success is an elaborate and dynamic communications network. Millions and millions of cells, organized into sets and subsets, gather like clouds of bees swarming around a hive and pass information back and forth in response to an infection. Once immune cells receive the alarm, they become activated and begin to produce powerful chemicals. These substances allow the cells to regulate their own growth and behavior, enlist other immune cells, and direct the new recruits to trouble spots.  source