如果高致病禽流感(HPAI或禽流感)病毒转移到了人类当中，那么感染该病毒的活禽可引发流感大流行。
Live birds infected with highly pathogenic avian influenza (HPAI, or bird flu) can infect humans.
如果H5N1型病毒发生变异，使其容易地在人间传播并得不到遏制，这就可能引发一场流感大流行。
If the H5N1 virus changes to allow it to pass easily from person to person, and it goes unchecked, this could trigger an influenza pandemic.
当然，真正的禽流感大流行还会引发一大堆其它问题。
A real pandemic, of course, would throw up a host of other problems.
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