Exam Study Guide - DIsease Ecology, Plagues

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University of Toronto Scarborough
Health Studies
Caroline Barakat

Disease Ecology Parasites organism that grow, feds, and is sheltered an or in a different organism and that does not contribute to the survival of its host Virus ultimate micro-parasite smaller than bacteria; neither cells not organism; can only reproduce with their host Marco-parasites composed of many cells; cycles through transmission stages (eggs and larvae) which pass into the external environment Transmission movement of a parasite from host to host Incubation period interval of time required for development of a disease Latent period seemingly inactive period between exposure to an inflection and subsequent illness Parasite virulence capacity of a parasite to cause disease Zoonotic infections animal infections that can be transmitted to humans nd R 0reproductive ratio of disease) - how many people one person can affect; # of 2 infections expected Main factors that influence the occurrence of a disease: 1. host (immunity, genetics, nutrition) 2. environment (promote exposure) 3. agent (biological, physical, chemical, psychosocial, rate of growth, persistence) Mode of disease transmission: - Direct transmission from person to person - Indirect through a common ratevector eg. Contaminated waterair Portal of entry: - Dermal through the skin (eg. Fungus) - Ingestion through the mouth (eg. E.coli in water) - Inhalation during respiration (eg. Particulate matter) - Aspiration airway entry Types of diseases: -broad spectrum of disease severity iceberg concept Tuberculosis infectious disease that most commonly attack the lungs Measles common skin rash, transmitted from respiration Rabies affects central nervous system, transmitted through saliva www.notesolution.com
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