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流感大流行(影响世界大部分地区的疾病暴发)属于不可预测,但又重复发生的事件,可对世界范围内的卫生、经济和社会造成影响。当关键因素出现交集时,就会发生流感大流行,即流感病毒的出现伴随着可持
Influenza pandemics (diseases that affect most parts of the world) are unpredictable but recurring events that have an impact on health, economics and society worldwide. A flu pandemic occurs when there are intersections of key factors, namely the emergence of influenza viruses