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甲型H1N1流感自2009年4月首先在墨西哥和美国等北美洲国家暴发流行以来,在一个多月的时间里即迅速席卷全球60多个国家和地区,
Influenza A (H1N1) swiftly swept over 60 countries and regions in more than a month since its outbreak in April 2009 in North America such as Mexico and the United States.