Factors affecting disease

Question 1

What four factors affect disease?

Answer 1

• temp
• relief
• precipitation
• water source

Question 2

How does water sources affect disease?

Answer 2

Mosquitos lay eggs in water, so more water results in more breeding ground for mosquitos

Question 3

How does relief affect disease?

Answer 3

Because as altitude causes changes in climate and disease habitats

Question 4

How does temperature affect malaria?

Answer 4

27 degrees is optimum temp for mosquitos to develop, so lower temps can result in mosquitos not being able to develop properly so cant transmit

Question 5

How does altitude affect malaria?

Answer 5

As altitude increases, temperature decreases. Mosquitos cant survive when altitudes are 2000meters

Question 6

How does humidity affect malaria?

Answer 6

Mosquitos survive better under high humidity. If average monthly relative humidity is below 60%, its believed that the life of mosquito is short so little malaria transmission

Question 7

Give 2 examples of diseases being affected by seasonal change:

Answer 7

1) Vector born diseases often reach peak during rainy season eg- bilharzia

2) Epidemics of influenza peak in winter months