为什么没人提2009年的甲流？ - 知乎
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2009年 H1N1疫情也在一年之后自动结束，至于在中国实际上流行的时间远远不到一年。 跟流感比较的话，2009年H1N1的确是近年来最严重的一年，虽然上报数字中感染人数仅为12万，但后来的一些研究认为北京可能有10%的人曾被感染。
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