基因种系发生树表明近几年甲型流感病毒与90年代流行株存在基因特性不同的分支。
The phylogenetic tree showed that in recent years there existed a branch for influenza a virus of genetic characteristic different from that of epidemic strains in 1990s.
结果治疗前的HVR1区氨基酸序列高度变异，基于HVR1序列的种系发生树提示序列变化与干扰素应答类型无关。
Phylogenetic tree analysis based on pretreatment HVR1 sequences was undertaken. Results The E2 HVR1 sequences from pre treatment sera were highly diverse among different isolates.
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