That is interesting, jodywy.
DDT kills a lot of people each year, but it's because it isn't used enough. Mosquitoes were "dying like flies," and problems like malaria were being greatly subdued when DDT was in wide use. The greenie-weenies howled long enough and hard enough that the product is no longer available. Mosquitoes have come back with a vengeance, and they spread disease with the same vengeance.