Chapter 14 - Chapter 14 Principles of Disease/Epidemiology...

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Chapter 14 Principles of Disease/Epidemiology Pathogens- Microorganisms that cause a recognized disease Etiology- cause of a disease, disease signs and symptoms, and the final effects on the body Infection- successful colonization of a host Disease- induced change from a state of homeostasis Normal Microbiota: Those organisms that live in, or on, the body in a mutualistic, commensal, or symbiotic relationships. Microbial antagonists prevent colonization of the body by pathogens. Short-term inhabitants that are picked up from the environment are called transient micro flora. Etiology of Infectious Diseases Be sure you know Koch’s Postulates : these are used to identify unknown pathogens 1. A suspected pathogen must be isolated from diseased animals. 2. It must be identified and grown in the lab in pure culture. 3. A susceptible, healthy test animal must develop the disease when inoculated with the suspected pathogen. 4. The original pathogen must be recovered from the test animal and isolated in pure culture; it must be identified as the original suspected pathogen. Classification of Infectious Diseases
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Chapter 14 - Chapter 14 Principles of Disease/Epidemiology...

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