Different Types Of Disease Diffusion

Question 1

Expansion meaning and example

Answer 1

There is one place of origin and the disease remains in that place as well as spreading out over time.

An outbreak of TB

Question 2

Relocation and example

Answer 2

The disease leaps from one place to another over time as it spreads

For example, the 2010 cholera epidemic in Haiti came from Nepal and was brought over by international aid workers. Killed 7000.

Question 3

Contagious and example

Answer 3

Spread by direct contact and the influen e is strongest at the place of origin. The influence lessens as you get further from the place of origin.

Example: 2014 ebola epidemic in W. Africa

Question 4

Hierarchical and example

Answer 4

Spread throughout class or group. Disease can be channelled in road, air of rail transport.

2009 HINI flu virus became a pandemic through flight routes, resulting in 12 500 deaths

Question 5

Hagestrand effect

Answer 5

A model linked to diffusion.

Question 6

Neighbourhood effect

Answer 6

Consists of the probablity of contact between carrier and non carrier is determined by the no. people living in each 5x5km^2 and their distance apart.

Question 7

Barriers to diffusion and examples

Answer 7

Obstruct the flow of information or people which slows down the spread of disease.

Physical barriers: mountains, oceans

Socioeconomic: linguistic barriers, gov. can discourage movement between peoples