季节性流感的变异较缓和，被称为渐变；当像H1N1这样的新型病毒株发生变异的时候，这就是突变了。
When the mutations are gradual, as with seasonal flu, it is known as drift; when they are abrupt, as with the new strain of H1N1, you have a shift on your hands.
目的分析2006年中国季节性流感的流行状况，以及病毒的抗原性和基因变异情况。
Objective To analyze seasonal influenza epidemic situation in 2006, and to analyze the genetic and antigenic characteristics of viral hemagglutinin (HA) gene.
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