There is evidence that countries are having difficulties in reducing reliance on DDT due to increase in the incidence of malaria cases especially where parasite prevalence and transmission are still relatively high.
有证据表明，由于特别在寄生虫大量孳生和疾病传播速度较快的地区疟疾病例增加，各国在减少对滴滴涕的依赖方面有困难。