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.
4月29日世界卫生组织将这一新型疾病列为其六级警戒系统的第五级。
For on April 29th the World Health Organisation (WHO) promoted the new disease to level five of its six-level pandemic alert.
现在的警戒水平处于六个级别中的第五级，这意味着流行性疾病即将发生。
Currently the alert level stands at five out of six meaning a pandemic is imminent.
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