Malaria

Malaria is an infectious disease caused by protozoan parasites. It is widespread in tropical and subtropical regions, including parts of the Americas, Asia, and Africa. Each year, it causes disease in approximately 515 million people and kills between one and three million people, the majority of whom are young children in Sub Saharan Africa. Malaria is commonly associated with poverty, but is also a cause of poverty and a major hindrance to economic development.
Malaria is one of the most common infectious diseases an enormous public health problem. The disease is caused by protozoan parasites of the genus Plasmodium.
Malaria parasites are transmitted by female Anopheles mosquitoes. The parasites within red blood cells, causing symptoms that include symptoms of anemia (light headedness, and shortness of breath, tachycardia etc), as well as other general symptoms such as fever, chills, nausea, flu-like illness, and in severe cases, coma and death. Malaria transmission can be reduced by preventing mosquito bites with mosquito nets and isect repellents, or by mosquito control measures such as spraying insecticides inside houses and drining atansing water where mosquitoes lay their eggs.

Source: Wikipedia