Lanzhou;
Veterinary;
Research;
Institute,;
Chinese;
Academy;
of;
Agricultural;
Sciences;
State;
key;
Laboratory;
of;
Veterinary;
Etiological;
Biology;
Key;
Laboratory;
of;
Grazing;
Animal;
Diseases;
of;
Ministry;
of;
Agriculture;
and;
Key;
Laboratory;
of;
Animal;
Virology;
of;
Ministry;
of;
Agriculture,;
Lanzhou;
730046,;
China;
副猪嗜血杆菌; 靶基因; 施工方; DNA连接酶; PCR方法; 多发性浆膜炎; 遗传操作; 上呼吸道;