Wild waterfowl are considered the natural reservoir of all influenza a viruses 野生水鸟是a型流感病毒的天然宿主。
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This finding long suggested that wild waterfowl are not agents for the onward transmission of these viruses 这一发现提示野生水鸟并非是病毒传播给禽类的直接宿主。
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The spokesman stressed that avian influenza viruses exist naturally in wild waterfowl . there is no immediate threat to public health and the measures taken are aimed at controlling the disease in waterfowl 发言人?调，水禽是禽流感病毒的天然带菌者，是次事件并没有对公众?生构成即时威胁，而所采取措施的目的是控制水禽疾病。
