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Plagues and peoples – Chapter one Notes
Parasites: organism that grows, feeds, and is sheltered on or on 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
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 infection and subsequent
Parasite virulence: capacity of a parasite to cause disease
Zoonotic infections: animal infections that can be transmitted to humans
What are the main factors that influence the occurrence of a disease?
•Example: Contaminated water
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