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In order to provide control and prevention measures against an influenza pandemic, we investigated the epidemic characteristics of influenza from January 2001 in some surveillance sites of Fujian province, especially in Fuzhou city. We isolated 42 influenza viruses in 2001, 32 of them were H1N1, 10 isolates belonged to the B/Yamagata lineage. We did not isolate H3N2 in 2001. But in 2002, we isolated...