应该调查病毒在动物之间的传播可能性。
The possibility of animal-to-animal transmission has to be investigated.
最近的经验表明，从根源上处理公共卫生威胁是减少其国际传播可能性的最有效方法。
Recent experience shows that addressing public health threats at their source is the most effective way to reduce their potential to spread internationally.
两亿只禽鸟已由该病毒直接造成死亡或作为第一线防御被扑杀，以便遏制疫情和减少向人传播的可能性。
Two hundred million birds have been killed directly by the virus or culled as the first line of defence to contain outbreaks and reduce the possibility of transmission to humans.
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