Yamada : The number of malaria cases has declined by at least half in 25 countries . Zanzibar has virtually eliminated the disease over the past 20 years . Zambia encourages the use of insecticides , bednets , and appropriate treatment . Since 2000 , the number of reported malaria cases , deaths , or both has declined by at least half in 25 countries . Bill & Melinda Gates Foundation helps implement a malaria control program .
Yamada : The number of malaria cases has declined by at least half in 25 countries . Zanzibar has virtually eliminated the disease over the past 20 years . Zambia encourages the use of insecticides , bednets , and appropriate treatment . Bill & Melinda Gates Foundation helps implement a malaria control program .