Several influenza A viral subtypes were isolated from pigs during a severe outbreak of respiratory disease in Korea during 2005 and 2006.

在2005年和2006期间年韩国的猪爆发了严重的呼吸道疾病，并从中分离出了几种流感病毒A的亚型。

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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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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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