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.
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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