They are known to carry viruses of the H5 and H7 subtypes, but usually in the low pathogenic form.
据知，它们携带H5和H7亚型病毒，但通常是低致病性的。
On present understanding, H5 and H7 viruses are introduced to poultry flocks in their low pathogenic form.
据目前所知，H5和H7型病毒以低致病形式传给禽类。
Migratory birds can carry these viruses, in their low pathogenic form, over long distances, but do not usually develop signs of illness and only rarely die of the disease.
候鸟可以低致病性方式远距离携带这些病毒，但通常不显示疾病体征并且很少死于该病。
Wild birds, particularly waterfowl, are a key element of the viral ecology of low pathogenic avian influenza.
野生鸟类，特别是水鸟是低致病性禽流感病毒生态学的关键因素。
Considerable circumstantial evidence suggests that migratory birds can introduce low pathogenic H5 and H7 viruses to poultry flocks, which then mutate to the highly pathogenic form.
相当多的旁证表明侯鸟能够传播低致病性禽流感的H5和H7亚型病毒给家禽，然后，变异成高致病性类型。
These samples were collected from apparently healthy ducks and initial test results indicate the presence of low pathogenic avian influenza (LPAI) virus, which poses no threat to human health.
这些样本是从外观正常的鸭群中间抽取的，初次调查表明其中含有低致病禽流感病毒，该病毒对人体健康没有威胁。
Low pathogenic avian influenza commonly occurs in wild birds and can be found in a number of duck populations including the Northern pintail.
低致病禽流感病毒通常出现于野禽，并且可以在很多鸭类包括北长尾鸭中找到。
Wong concluded that "Initial tests show the chickens have been infected with low-pathogenic H5N2, rather than high-pathogenic H5N1 strain."
该负责人说，初步检测表明，鸡群感染了低致病性H5N2毒株，而不是高致病性的H5N1毒株。
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H9N 2毒株(亚洲系)也引发了人间少数轻微呼吸道疾病病例。
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H9N 2毒株(亚洲系)也引发了人间少数轻微呼吸道疾病病例。
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