第二种假定注重于家禽传播给人的可能直接来源。
The second hypothesis is focusing on a possible direct source of poultry-to-human transmission.
乌骨鸡是我国独特的家禽品种，是分布广泛的古老鸡种之一。
Black-bone chicken is one kind of unique domestic chicken breeds and widely spreads in China.
乌骨鸡是我国独特的家禽品种，是分布广泛的古老鸡种之一。
Black-bone chicken is one kind of unique domestic chicken breeds and widely spreads in China.
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