Malaria kills over a million people a year and is second only to tuberculosis in its impact on world health. The parasitic disease is present in 90 countries and infects one in 10 of the world's population - mainly people living in Africa, India, Brazil, Sri Lanka, Vietnam, Colombia and the Solomon Islands. There are four main types of malaria, all spread by moquitoes. Ninety per cent of all malaria cases are in sub-Saharan Africa where it is the main cause of death and a major threat to child health. Worldwide, a child dies of malaria every 30 seconds.
Pregnant women are also particularly vulnerable to the disease.
Early diagnosis of malaria, for which there is currently no vaccine, can lead to sucessful treatment and prevent death. The BBC is not responsible for the content of external internet sites.