禽流感的出现给科学家设计疫苗带来极大的挑战，因为禽流感可感染许多不同的动物，包括鸟禽、宠物和人类。
The emergence of bird flu has posed a major challenge to scientists designing vaccines as it can infect a number of different animals, including birds, pets and people.
流感也可以感染许多不同种类的温血动物，例如鸟类。
Influenza can also infect many different warm-blooded animals, such as birds.
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。
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.
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