Hägerstrand's Diffusion Model Flashcards

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1
Q

Important concepts of Hägerstrand’s Diffusion Model

A
  • A neighbourhood effect: the probability of contact between those infected and those not infected and the influence of decay
  • The number of people infected: represented by an S-shaped curve over time
  • The interruption of the progress of a disease by physical barriers
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2
Q

Primary (1st) stage of Hägerstrand’s Diffusion Model

A

There is a strong contrast in disease incidence

between the area of outbreak and remote areas

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3
Q

Diffusion (2nd) stage of Hägerstrand’s Diffusion Model

A

New centres of disease outbreak occur at distance from the source and this reduces the spatial contrasts of the primary stage

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4
Q

Condensing (3rd) stage of Hägerstrand’s Diffusion Model

A

The number of new cases is more equal in all locations, irrespective of distance from the source

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5
Q

Saturation (4th) stage of Hägerstrand’s Diffusion Model

A

Diffusion decelerates as the incidence of the disease reaches its peak

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6
Q

Physical barriers of disease diffusion

A

Distance, mountains, sea, deserts, climatic change or general climatic conditions such as tropical or continental

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7
Q

Socio-economic barriers of disease diffusion

A

Political border checks, imposition of curfews or quarantining. Most of these are put in place by international organisations and/or governments

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