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在70年代后期,由于广泛开展根除和控制疟疾的计划,世界上有许多地区已消灭了疟疾,到目前为止有4亿人口已免除了疟疾的威胁,但全世界仍有50%人口生活在疟疾流行区,有些已经消灭了疟疾的国家又重新出现了疟疾。美国就是如此,在国外旅行的美国人发生疟疾的人数显著增加。为了进一步确定美国人在国外旅行时得疟疾的危险性并加强防疟计划,作者分析了1970～1976年
In the late 1970s, malaria had been eradicated in many parts of the world due to widespread programs of eradication and malaria control, and so far 400 million people have been relieved of the threat of malaria, yet 50% of the world’s population is still living with malaria In endemic areas, some countries that have already eliminated malaria have re-emerged from malaria. That is the case in the United States where the number of malaria-causing Americans who travel abroad has increased significantly. In order to further determine the risk of malaria in the United States while traveling abroad and to strengthen anti-malarial programs, the author analyzed the prevalence of malaria in 1970-1976