There are currently large efforts to make malaria prevention and treatment affordable, but unfortunately this is not quite sufficient, as my research with Doug Gollin shows. A larger problem is that prevention is not efficient enough, so that even at minimal costs you still have substantial malarial prevalence and large impacts on economies. Cost reductions like the one Keasling is generating will have an impact on the economic consequences of the disease, but unfortunately not its spread. It may in fact increase it, as people will find it less useful to protect themselves.