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Lecture 9 Epidemiology_II

Lecture 9 Epidemiology_II - Basic Epidemiologic Principles...

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Basic Epidemiologic Basic Epidemiologic Principles Principles Janet M. Scarlett, DVM, MPH, PhD
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I nfection: I nfection: the entry and development or multiplication of an infectious agent in the body of an animal or man.
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Contrast with Contrast with Colonization Contamination Infestation
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Other infectious disease Other infectious disease definitions definitions Incubation period: the interval between the entry of the agent into the host and the onset of disease in that host Reservoir: the reservoir of infection is that place in which the agent usually lives and multiplies and on which it depends for survival, reproducing itself in such a manner that it can be transmitted to a susceptible host.
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Definitions, Definitions, continued… continued… Communicable period: is the time or times during which an infectious agent may be transmitted from one infected individual to another (directly or indirectly).
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The I nfectious Disease The I nfectious Disease Process Process 1. Etiologic agent 2. Reservoir 3. Portal of exit 4. Mode of transmission 5. Portal of entry 6. Susceptible host
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Reservoir Reservoir A. Human 1. Acute clinical cases 2. Carriers a. Inapparent (subclinical) b. Incubatory c. Convalescent d. Chronic B. Animal C. Environment (free-living)
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PORTAL of ESCAPE PORTAL of ESCAPE 1. Respiratory 2. Genitourinary 3. Alimentary 4. Skin 5. Transplacental
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