They don’t mention DDT in this article and I hadn’t heard it was being made again, but it looks like the insecticide laced bed netting and spraying of houses with something is doing the trick for now.
For Tanzania and Zanzibar:
Figures compiled by his office indicated that there were nearly 417,000 suspected malaria infections in 2004 among the two islands’ population of just over 1 million people, many of whom live in mud huts. By last year, the number of suspected cases had dropped to 14,500, while the population had increased by about 100,000.
Bush had the goal in 2005 of cutting malaria by half in 15 African countries. He’s well on his way.