Do migratory birds spread highly pathogenic avian influenza viruses?
候鸟是否传播高致病性禽流感病毒？
Avian influenza viruses become more active when temperatures turn cooler.
禽流感病毒在气温转为凉爽时变得更为活跃。
On rare occasions, avian influenza viruses have crossed the species barrier to infect humans.
在极少数情况下，禽流感病毒已跨越物种屏障，感染人类。
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