a. Describe how cholera is transmitted.

The table shows the number of cases of cholera and deaths from the disease for the five countries with the greatest outbreaks as reported to the WHO in 2010.

b. With reference to the table:

i. Calculate the case fatality rate for Haiti in 2010

ii. Suggest why the case fatality rate varies between countries

iii. Explain why it is important that the WHO collects data on outbreaks of cholera.

c. The WHO also collects data on ‘imported’ cases of cholera. Among countries reporting these cases in 2010 were Australia, Malaysia and the USA.

i. Suggest what is meant by the term ‘imported case’.

ii. Explain why there are no epidemics of cholera in highly economically developed countries such as Australia and the USA.

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Case fatality rate | % Total number of Country Region Number of deaths cases Haiti Cameroon Nigeria Democratic Republic of the Congo Papua New Guinea Total Caribbean 179379 3990 10 759 44456 657 6.10 1712 3.85 West Africa 13884 182 1.31 Australasia All regions of the world 8997 95 1.06 317534 7543 2.38