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Malaria is caused by a parasite and dengue is caused by a virus. These diseases are mostly spread by mosquitoes. The best way of getting attacked by malaria or dengue is to prevent getting bitten by mosquitoes. using mosquito nets at night is an import part of preventing such diseases. Also one should be careful about not storing water for long periods of time near the house. Using mosquito nets in the windows can be another way of preventing such diseases from attacking.