这是一种影响人类免疫系统的疾病，使得个体更易感染一些致死传染病。
A disease affecting the human immune system, making individuals more susceptible to deadly infections.
这种急性大脑传染病几乎总是导致死亡。
This acute infection of the brain is almost invariably fatal.
据疾病控制和预防中心介绍，疟疾是全世界传染性疾病中第五大可致死疾病。
Malaria's the fifth cause of death from infectious disease worldwide, according to the Centers for disease Control and Prevention.
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