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目前测定家禽疫苗成品有无外源因子污染是通过无特定病原体的鸡接种该疫苗后是否产生抗禽白血病病毒(ALV)等特定病毒
At present, it is determined whether the contamination of the exogenous factor with the finished poultry vaccine product is whether the specific virus such as anti-avian leukosis virus (ALV) is produced after vaccination of the chicken without the specific pathogen