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今年4月中旬,甲型H1N1流感在墨西哥出现,并迅速向世界各地流行。到6月11日,世界卫生组织已经将全球甲型H1N1流感的警戒级别提升至最高的6级。
In mid-April this year, the influenza A (H1N1) virus emerged in Mexico and quickly became popular all over the world. By June 11, the World Health Organization has raised the alert level of the global H1N1 influenza virus to the highest level 6.