	对禽流感常见的询问回答

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禽流感常见的询问回答

那类病毒可造成高致病性禽流感

禽流感，A类流感病毒有16H的亚型和9N亚亚型。仅有H5和H7亚型是已知的两个高致病性类型病毒。然而，并不是所的H5和H7亚亚型具有高致病性，也不是所有的两个亚型对禽类造成严重疾病。基于当前所知，H5和H7病毒传播到在家禽间以低致病性的形式传播。在互相传播时，该型病毒可以发生变异，一般在几个月内，变异成高致病性类型。这就是为何一旦在家禽出现H5和H7两型传播，总是引起人们的关注，即便最初感染的症状很轻微。

来源：世界卫生组织官方网站

（jerrydoctor）

Avian influenza frequently asked questions

Which viruses cause highly pathogenic disease?

December 2, 2005

Influenza A viruses1 have 16 H subtypes and 9 N subtypes2. Only viruses of the H5 and H7 subtypes are known to cause the highly pathogenic form of the disease. However, not all viruses of the H5 and H7 subtypes are highly pathogenic and not all will cause severe disease in poultry.

On present understanding, H5 and H7 viruses are introduced to poultry flocks in their low pathogenic form. When allowed to circulate in poultry populations, the viruses can mutate, usually within a few months, into the highly pathogenic form. This is why the presence of an H5 or H7 virus in poultry is always cause for concern, even when the initial signs of infection are mild.

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