The command term “contrast” requires candidates to give an account of the differences between the two diseases (not their similarities). 

The focus should be on the impacts of the diseases, rather than their causes. Impacts could be related to contrasting levels of economic development (LEDC versus MEDC). 

The impacts will depend on the two diseases chosen. Some imbalance in the coverage of the two diseases is acceptable, even when awarding full marks. Geographic impacts may be subdivided into demographic, economic, social, political, etc, or by scale into local, national, regional, international. Either approach is acceptable for full marks, though it is likely that stronger responses will combine these approaches in some way. 

The term “impacts” is understood to include measures taken with respect to the prevention, treatment, cure (if applicable) and management of the diseases, as well as mortality rates, lost working hours, health care costs, etc.