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Lecture 1 Plagues

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Health Studies
Caroline Barakat

PLAGUES-LECTURE 1 NOTES -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; not able to survive on its own and it requires a being for its survival (bottom of pg.8, 9) -virus: ultimate micro-parasite; smaller than bacteria; neither cells not organisms; can only reproduce within their host; genetic material wrapped in protein that can cause harm to a host -macro-parasites: composed of many cells; cycles through transmission stages (eggs & larvae) which pass into the external environment; e.g round worms, tape worms, flies; some live on surfaces (ticks) and some live inside body (HIV virus); some have complex life cycles and have several hosts (malaria) -transmission- movement of a parasite from host to host; usually caused by contaminated utensils -incubation period: interval of time required for a disease to develop; the time period where the parasite is doing something (replicating or preparing to replicate); period of time where there is indication where something is happening -latent period: seemingly inactive period between exposure to an infection and subsequent illness; in that period of time there is inactivity or seemingly inactive period of time where potentially nothing is happening -distinction between above 2 where incubation period, something is happening whether its preparing to replicate or replication and latent period is a period of dormancy -parasite virulence: capacity of a parasite to cause disease; how strong is it to effect to cause
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