H5N1 appears to have expanded its host range, infecting and killing mammalian species previously considered resistant to infection with avian influenza viruses.
H5N1病毒似乎扩大了宿主范围，导致以往被视为对禽流感病毒具有抵抗力的哺乳类动物的感染和死亡。
Avian influenza virus can cause serious disease in a wide variety of birds and mammals, but generally its natural host range is limited to wild ducks and gulls.
禽流感病毒可感染许多鸟类和哺乳动物，但是其自然宿主范围通常限于野生水禽，如野鸭、海鸥等。
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