Disease Diffusion

Question 1

Reasons for the spread of disease

Answer 1

• Crowded living + working conditions
• Inadequate (or no) satiation
• Unclean water supplies
• Inadequate nutrition (too little or too much)
• Low income so no medical help or resources (e.g. soap, mosquito nets, antiseptic cream)
• Long working hours
• Physically exhausting work
• Lack of or inaccessible health care
• Exposure to health risks at work as legislation is not enforced
• Inadequate education (e.g. HIV/AIDS sufferers not understanding the concept of safe sex)

Question 2

Expansion diffusion

Answer 2

The disease has a source and spreads outwards into new areas. The source area remains infected

Question 3

Relocation diffusion

Answer 3

The disease leaves the area of origin and moves into new areas

Question 4

Contagious diffusion

Answer 4

The spread is through direct contact with a carrier

Question 5

Hierarchical diffusion

Answer 5

Disease spreads through a structured sequence of locations, usually from large, well-connected centres to smaller, more isolated centres

Question 6

Disease diffusion

Answer 6

The process by which a disease spreads outwards beyond its geographical source