-- I recently accompanied Margaret Chan , Director General of the WHO , and Ray Chambers , U.N. Special Envoy for Malaria , on a trip to Africa to see firsthand the region 's fight against malaria . Yamada : The number of malaria cases has declined by at least half in 25 countries . Comment: Zambia expanded the use of insecticides , bednets , and appropriate treatment . Bill & Melinda Gates Foundation helps funding a malaria control program .
Yamada : The number of malaria cases has declined by at least half in 25 countries . Comment: Zambia expanded the use of insecticides , bednets , and appropriate treatment . Bill & Melinda Gates Foundation helps funding a malaria control program .