Key;
Laboratory;
of;
Grazing;
Animal;
Diseases;
of;
Ministry;
of;
Agriculture;
Key;
Laboratory;
of;
Animal;
Virology;
of;
Ministry;
of;
Agriculture;
and;
State;
KeyLaboratory;
of;
Veterinary;
Etiological;
Biology,;
Lanzhou;
Veterinary;
Research;
Institute,;
Chinese;
Academy;
of;
Agricultural;
Sciences,;
Lanzhou730046,;
China;
