Theory Background: Acute viral upper respiratory infection is a most common clinic infective disease, and about 70%-80% of it is caused by virus.

理论背景急性上呼吸道感染是临床最常见的一种感染性疾病，约有70% - 80%由病毒引起。

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Infective serositis in ducks, an acute infectious disease, is caused by Bang's bacillus. Major clinic characters include high incidence rate and death rate, nerve symptoms and difficulty in breathing.

鸭传染性浆膜炎是由鸭疫巴氏杆菌引起的急性传染病，发病率和死亡率高，神经症状和呼吸困难为其主要临床特征。

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