它们是一组引起哺乳动物和鸟类疾病的病毒。
They are a group of viruses that cause diseases in mammals and birds.
但人们最担忧的是这背后对人类健康的启示：当禽流感已经夺去数人的生命，它还能只算作一种鸟类疾病吗？
But most of all, everyone worried about the implications for human health of what is-though it has indeed claimed some human victims-still basically a bird disease.
无可争辩的是，鸟类携带着这种疾病。
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