HLTB21H3 Lecture Notes - Lecture 1: Industrial Revolution, Herd Immunity, Rodent

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9 Dec 2015
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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. Virus ultimate micro-parasite smaller than bacteria; neither cells not organisms; can only reproduce within their host. Macro-parasites composed of many cells; cycles through transmission stages (eggs and larvae) which pass into the external environment. Incubation period - interval of time required for development of a disease. Transmission - movement of a parasite from host to host. Latent period - seemingly inactive period between exposure to an infection and subsequent illness virulence - capacity of a parasite to cause disease. Zoonotic infections - animal infections that can be transmitted to humans. Three main factors that influence disease: host, agent, & environment. Direct transmission - from person to person. Indirect transmission through a common route / vector, e. g. contaminated air /mosquito. Dermal through the skin, e. g. fungus. Ingestion through the mouth, e. g. e. coli in water.

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