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HLTB21H3 (177)
Chapter 1&2

Chapter 1 & 2 important definitions

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University of Toronto Scarborough
Health Studies
Caroline Barakat

Plague- highly infectious, usually fatal epidemic disease.a serious, potentially life-threatening infectious disease that is usually transmitted to humans by the bites of rodent fleas Parasites organism that grows, feeds, and is sheltered on or in a different organism and that does not contribute to the survival of its host. Parasitism the intimate association of 2 different kinds of organisms wherein one benefits at the expense of the other. Macro-parasites composed of many cells, can be seen without the use of microscope; cycles through transmission stages (eggs and larvae) which pass into the external environment, do not multiply in the host. Virus ultimate micro-parasite smaller than bacteria; neither cells nor organisms; can only reproduce within their host can be killed if their DNA or RNA is destroyed. Incubation period -interval of time required for development of a disease Latent period -seemingly inactive period between exposure to an infection and subsequent illness Vector - an organism that transmits a pathogen from reservoir to host Transmission the movement of parasite from host to host whether direct or indirect. Host organism harboring another organism on or in itself Agent Biological, physical, chemical, psychosocial. Rate of growth, persistence. (eg.bacteria) Environment- promote exposure of the disease (ex. Contaminated water) Herd immunity resistance of a group to a disease attack due to immunity. Parasite virulence -capacity of a parasite to cause disease Endemic usual occurrence of a disease within a given geographical area Epidemic occurrence of a disease in excess of normal expectancy Pandemic worldwide epidemic Pathogen- an infectious agent, or more commonly germ, is a biological agent that causes disease to its host. Incidence - a measure of th
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