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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
illness
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?
Host
Immunity
Genetics
Nutrition
Example: Person
Environment
Promote exposure
Example: Contaminated water
Agent
Biological
Physical
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Document Summary

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. Vi rus: 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. T ransmission: movement of a parasite from host to host. I ncubation period: interval of time required for development of a disease. Latent period: seemingly inactive period between exposure to an infection and subsequent illness. Parasite virulence: capacity of a parasite to cause disease. Zoonotic infections: animal infections that can be transmitted to humans. Agent: biological, physical www. notesolution. com, chemical, psychosocial, rate of growth, persistence, example: bacterium. Di rect t ransmission: from person to person. I ndirect t ransmission: through a common route/vector. Portal of entry: dermal: through the skin ,e. g. fungus. Ingestion: through the mouth, e. g. e. coli in water.

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