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H9N2

H9N2

H9N2

H9N2

1

However , since 1999 the genesis and evolution of H9N2 viruses in different types of poultry have not been systematically investigated.

然而，直到 1999年 H9N2 病毒的遗传进化没有在其他不同的禽类中被系统的发现。

2

In addition , the low-pathogenic H9N2 strain (Asian lineage ) has caused a few human cases of mild respiratory illness .

此外，低致病性 H9N2 毒株（亚洲系）也引发了人间少数轻微呼吸道疾病病例。

3

Genetic analysis revealed 35 genotypes of H9N2 viruses , including 14 novel genotypes that have not been recognized before .

基因分析显示 H9N2 病毒有 35 基因型，其中 14 个基因型以前没有被识别过。

4

In addition, there were always some positions differentially selected for viruses from different hosts .

对于来自不同宿主的 H9N2 病毒总是存在一些氨基酸位点受到不同的选择压力作用。

6

In April , two cases of avian influenza A (H9N2) affecting humans were confirmed in Hong Kong for the first time .

四月，本港首次证实两名病人染上甲类流行性感冒 h9n2 病毒。

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