Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

Infectious Diseases

This guide helps students find information about infectious diseases. Use the following sources as starting points for research on various topics in the field of infectious diseases.

Background Information

The Gale Encyclopedia of Senior Health defines infectious diseases as, "infectious disease—also called communicable disease—is any illness caused by an infective agent. Infective agents include microbes—primarily bacteria, viruses, protozoa, and fungi—that can be passed to or among humans by various means."

The article goes on the describe infectious diseases; when an infective agent enters the body and begins to multiply, the immune system responds with various defensive mechanisms that protect against most infectious disease. However, when an infective agent temporarily evades or overwhelms the immune system and begins to damage tissues, signs and symptoms of disease develop."

(Source: Credo)

Reference: Encyclopedias and Dictionaries