The worst-ever outbreak of bird flu has led to the disease becoming endemic in some birds, inflicted huge costs on the poultry industry, spread into wild and captive mammals and, in some rare instances, infected humans.
有史以来最严重的一次禽流感在一些鸟类中流行,给家禽业造成巨大损失,并蔓延到野生和圈养哺乳动物,在一些罕见的情况下,还感染了人类。
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