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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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Evolution of Epidemiology

Host Factors

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Edward Jenner, in 1796, introduced the idea of host resistance to explain why some people were immune to smallpox.