今天,世界上大约有20亿人生活在疟疾流行地区,每年在这些人群中出现1600～1700万新病例。另外,每年有200万人死于疟疾,并且其中100万死亡者为5岁以下儿童。热带和亚热带地区为疟疾地区,也是人口生长率最高的地区,因此,疟疾威胁下的人口总数在一个短时间内将达 Today, about 2 billion people in the world live in malaria-endemic areas, and between 16 and 17 million new cases occur in these populations each year. In addition, two million people die of malaria each year, and one million of them are children under five years of age. The tropical and subtropical areas are malaria areas and also have the highest population growth rates, so the total number of people threatened by malaria in a short period of time will reach