Lecture 9 - Basic Epidemiologic Basic Epidemiologic Pr inciples Pr inciples Janet M Scarlett DVM MPH PhD I nfection I nfection the entry and

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Unformatted text preview: Basic Epidemiologic Basic Epidemiologic Pr inciples Pr inciples Janet M. Scarlett, DVM, MPH, PhD I nfection: I nfection: the entry and development or multiplication of an infectious agent in the body of an animal or man. Contr ast with Contr ast with Colonization Contamination Infestation 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. 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). The I nfectious Disease The I nfectious Disease Pr ocess Pr ocess 1. Etiologic agent 2. Reservoir 3. Portal of exit 4. Mode of transmission 5. Portal of entry 6. Susceptible host Reser voir Reser voir A. Human 1. Acute clinical cases 2. Carriers a. Inapparent (subclinical) b. Incubatory c. Convalescent d. Chronic B. Animal C. Environment (free-living) PORTAL of ESCAPE PORTAL of ESCAPE 1. Respiratory 2. Genitourinary 3. Alimentary 4. Skin 5. Transplacental M ODE of...
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This note was uploaded on 05/05/2009 for the course FD SC 396 taught by Professor Gravani during the Spring '09 term at Cornell University (Engineering School).

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Lecture 9 - Basic Epidemiologic Basic Epidemiologic Pr inciples Pr inciples Janet M Scarlett DVM MPH PhD I nfection I nfection the entry and

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