HLTB21H3 Lecture Notes - Herd Immunity, Iceberg, Escherichia Coli

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Published on 20 Aug 2012
School
UTSC
Department
Health Studies
Course
HLTB21H3
Disease Transmission
Definitions
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
Macroparasites composed of many cells; does not multiply in host, instead cycles through
transmission stageseggs and larvaewhich pass into the external environment
Transmission
- movement of a parasite from host to host
Incubation period
- the 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
Modes of Disease Transmission
- Direct occurs through direct contact, e.g. from person to person
- Indirect through a common route / vector, e.g. contaminated air / water, mosquito
Portal of entry:
- Dermal through the skin, e.g. fungi
- Ingestion through the mouth, e.g. E.coli in water
- Inhalation during respiration, e.g. particulate matter
- Aspiration- through environment
Types of diseases
Broad spectrum of disease severity Iceberg concept
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Document Summary

Organism that grows, feeds, and is sheltered on or in a different organism and that does not contribute to the survival of its host. Ultimate micro-parasite smaller than bacteria; neither cells not organisms; can only reproduce within their host. Macroparasites composed of many cells; does not multiply in host, instead cycles through transmission stages eggs and larvae which pass into the external environment. Movement of a parasite from host to host. Latent period the interval of time required for development of a disease. Seemingly inactive period between exposure to an infection and subsequent illness. Capacity of a parasite to cause disease. Animal infections that can be transmitted to humans. Direct occurs through direct contact, e. g. from person to person. Indirect through a common route / vector, e. g. contaminated air / water, mosquito. Dermal through the skin, e. g. fungi. Ingestion through the mouth, e. g. e. coli in water. Broad spectrum of disease severity iceberg concept.

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