Diffusion

Question 1

What are the four types of disease diffusion?

Answer 1

Expansion, relocation, contagious and hierarchical

Question 2

What is expansion?

Answer 2

Disease has a source and spreads out

Question 3

What is relocation?

Answer 3

Occurs when disease leaves an area and re locates into a new one

Question 4

What is contagious?

Answer 4

Describes spread of disease through direct contact

Question 5

What is hierarchical?

Answer 5

Disease spreads through an ordered sequence of places

Question 6

What are physical barriers to diffusion?

Answer 6

• oceans
• rivers
• mountains

Question 7

What are socio-economic barriers to diffusion?

Answer 7

boarders, vaccines, sanitation

Question 8

What are the 3 parts of hagerstands diffusion model?

Answer 8

• neighbourhood effect= closer u are more likely to get it
• S-shaped= number of infected accelerates, then levels out
• barriers= diffusion may be interrupted