That's what's so bad in countries like Zambia. Very few people die from malaria the first time they get it and it is very treatable when it is recognised soon enough. The access to the medication is generally poor in Africa though and people just keep getting malaria. As for prevention.. well.. back then the prevention methods didn't seem to do much for me. I got the tablets, we took measures against the mosquitos.. I still got it. The way I see it only big national programs can work. Mussolini might not be the greatest guy in history, but he did fight malaria very effectively.
I recently saw a picture of my friends there (although I honestly don't remember them all as I was four when we left, in part because I kept getting malaria) and my mother told me who had died because of malaria. It was one in two.