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 Mosquitoes can transmit a number of deadly diseases when they bite. Historically, the most important mosquito-borne diseases have been malaria, filariasis and viruses such as yellow fever, dengue and West Nile fever. Malaria still contributes to high death rates in developing countries and to global poverty. West Nile fever has, in recent years, generated a lot of concern in the US.
Malaria is caused by a protozoan parasite called a plasmodium. The parasite infects red blood cells causing a relapsing fever. During the parasite's life cycle certain stages attack the liver. Death from malaria is often caused by liver failure.
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