The distribution of malaria nets has served to prevent the spread of malaria in Africa, where the malaria parasite often proves resistant to cheap anti-malarial drugs. Though the nets have curbed the spread of malaria in nations such as Zambia, fewer than one in four African children sleeps under a malaria net, according to the World Health Organization. People who are infected with malaria -- in particular children and pregnant women, who lack the proper immune systems to respond to the disease -- must receive treatment within 24 hours of the onset of symptoms to prevent damage to internal organs.

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