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2009年4月底,自墨西哥发生首例新型H1N1流感(以下称甲流)以来,甲流在世界范围迅速蔓延。杭州市在5月31日发生首例输入性甲流病例,余杭区在8月中旬开始出现本地感染病例,以后陆续有聚集性病例发生。流感样病例病原学监测结果也表明,2009年8月至2010
By the end of April 2009, since the first new H1N1 flu in Mexico (hereinafter referred to as “the first A”), A has spread rapidly around the world. The first case of imported H1N1 influenza occurred on May 31 in Hangzhou City. The Yuhang District started to have local cases of infection in mid-August and there were successively cases of aggregation. Influenza-like case etiology monitoring results also show that from August 2009 to 2010