Diffusion Flashcards
1
Q
What are the four types of disease diffusion?
A
Expansion, relocation, contagious and hierarchical
2
Q
What is expansion?
A
Disease has a source and spreads out
3
Q
What is relocation?
A
Occurs when disease leaves an area and re locates into a new one
4
Q
What is contagious?
A
Describes spread of disease through direct contact
5
Q
What is hierarchical?
A
Disease spreads through an ordered sequence of places
6
Q
What are physical barriers to diffusion?
A
- oceans
- rivers
- mountains
7
Q
What are socio-economic barriers to diffusion?
A
boarders, vaccines, sanitation
8
Q
What are the 3 parts of hagerstands diffusion model?
A
- neighbourhood effect= closer u are more likely to get it
- S-shaped= number of infected accelerates, then levels out
- barriers= diffusion may be interrupted
