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In April 2009, a mysterious substance sent the world into a panic. A substance that can bring about death, the loss of a real person, a living human being. A disease raging through the crowds is a virus undetectable by all the existing most powerful tools -- the virus the World Health Organization calls Swine Flu. Recently, the flu is almost universal. And despite advances in science, there are still plenty of unknowns. We still don't know much about how a virus survives, other than the fact that it has to infect something else like human to replicate. Why is there a virus? We don't know the answer to that question. 
2009年4月，一种神秘莫测的物质让世界陷入了恐慌。那是一种能带来死亡的物质，随之失去的是一个个实实在在的人，鲜活的生命。疾病正在人群中肆虐，病源是现有最强大的工具都无法探测的生命体——病毒，世界卫生组织称之为猪流感。如今它已几乎遍布全世界。尽管科学在进步 ，未知依然大量存在。我们基本不清楚病毒该如何生存，只知道病毒必须感染其他生物才能进行复制。为什么会存在病毒？我们并不明确问题的答案。《病毒为何致命？》（上） 《病毒为何致命？》（下）
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