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	Module I

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	Introduction - Purpose - Tools & Applications - Influencing Factors - Infectious Diseases - Objectives
	Key Epi Terms - Epidemiology - Patterns of Infectious Disease - Natural History of Disease
	Evolution of Epidemiology - Supernatural Causation - Environmental Explanations - Host Factors - Toward a Modern Approach - Modern Epidemiology
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Key Epidemiological Terms

Patterns of Infectious Disease

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There are parallel terms referring to disease patterns in animals that may affect humans:

Zoonosis: An infection or an infectious disease transmissible under natural conditions between vertebrate animals and man (APHA).