Avian influenza virus type a has been identified as the cause, but the virus strain has not yet been determined.
禽流感A型病毒已被确认为病因，但是尚未确定病毒株。
Avian influenza (" bird flu ") is an infectious disease of birds caused by type a strains of the influenza virus.
禽流感是一种由甲型流感病毒所引起的禽鸟传染病。
Avian influenza is a violent infection which is caused by orthomyxoviridae type a influenza virus.
禽流感是由正粘病毒科中a型流感病毒引起的禽烈性传染病。
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