Human infection is still very rare, but the virus that causes the infection in birds might change, or mutate, to more easily infect humans.
禽流感病毒感染人类目前还是非常少见的，但是感染鸟类的病毒可能会产生变异，从而变得更加容易感染人类。
Human infection is still very rare, but the virus that causes the infection in birds might change, or mutate, to more easily infect humans.
禽流感病毒感染人类目前还是非常少见的，但是感染鸟类的病毒可能会产生变异，从而变得更加容易感染人类。
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