Chapter Four - Epidemiology Prevention and Control of...

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Epidemiology: Prevention and Control of Diseases and Health Conditions Chapter 4
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Classification of Diseases & Health Problems Communicable (infectious) vs. Noncommunicable (noninfectious) Diseases Communicable: caused by specific biological agent or its product and can be transmitted from infected to susceptible host Noncommunicable: one that cannot be transmitted from infected to susceptible host Acute vs. Chronic Diseases & Illnesses Acute: last 3 months or less Chronic: last more than 3 months
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Causative Agents for Diseases & Injuries
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Classification of Diseases
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Communicable Diseases Key terms Infectivity: the ability of a biological agent to enter and grow in a host Pathogenicity: the capability of a communicable disease agent to cause disease in a susceptible host Communicable disease model Host Agent Environment
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Communicable Disease Model - 1 Agent– the element that must be present in order for cause of the disease to occur
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Communicable Disease Model - 2 Agent Host– Any susceptible organism invaded by an infectious agent
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Communicable Disease Model - 3 Agent Host Environment– All other factors that inhibit or promote disease transmission
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Chain of Infection - 1 A model to conceptualize the transmission of a communicable disease from its source to a susceptible host
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Chain of Infection - 2 Pathogen the disease-causing agent (e.g., virus, bacteria, rickettsiae, protozoa, fungi & yeasts, nematoda)
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