疟疾仍然威胁着世界近半数的人口。人们正用DNA新疫苗进行反击。无人确知蚊子从何时开始把疟原虫寄生虫（更多地称为疟疾）注人人体。但从记述发现疟疾衰弱和常见致命症状的一些参考著作中便可追溯到这个书面词的起源。早在公元前27to年，一些著作就曾首次描述过剧烈的疟疾类热 Malaria still threatens nearly half of the world’s population. People are fighting back with new DNA vaccines. No one knows when mosquitoes injected the parasites of the malaria parasite (more commonly called malaria) into the human body. However, the origin of this written word can be traced back to some of the reference works on the discovery of the malaria debilitating and common fatal symptoms. As early as 27to BC, some works described the first severe malaria fever