These germs "are constantly mutating to breach your immune system's defenses" ("Germs" 2007). Once these germs breach the immune system, they multiply, resulting in the second link of spreading infectious diseases. As Germs multiply and breach the immune system, a person becomes sick.

The third and final step in the chain of spreading infectious diseases from person to person deals with that sickness. Once a person comes into contact with a germ, and the germ enters the body, multiplies, and attacks the body, the immune system "springs into action," using white blood cells, antibodies, and other methods of fighting that disease. These actions often have exteriorly obvious symptoms, such as sneezing and coughing ("Germs" 2007). At the end of this third link, the infectious disease has generally been vanquishd by the immune system.

While this chain of events suggests that spreading infectious diseases from person to person occurs relatively easily,...
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