Malaria prevention advance?

IRIN (via All Africa) has an interesting piece on malaria prevention efforts in Burkina Faso. Officials have launched a small project of the indoor spraying of the insecticide Bendiocarb. The World Health Organization notes that such programs are most effective when at least 80 percent of households are sprayed. Right now, the spraying is only occurring in the southwestern part of Burkina Faso, due to cost. The country counted some 4 million cases of malaria last year.