进口鸡肉传带禽伤寒沙门氏菌的定量风险评估

为分析进口鸡肉携带禽伤寒沙门氏菌(salmonella gallinarum)的风险水平,以及不同风险因子的影响大小,利用定量评估方法,通过场景分析,确定了影响鸡肉传带禽伤寒沙门氏菌风险的14个因子,依此构建风险评估数学模型,并参照2017年巴西禽伤寒沙门氏菌流行数据,对进口鸡肉传带禽伤寒沙门氏菌风险进行了定量评估。结果显示:鸡肉传带禽伤寒沙门氏菌的风险主要取决于鸡群病流行率及鸡群数量,其他因素影响很小;当进口鸡肉来源鸡群禽伤寒沙门氏菌流行率维持在0.05的水平时,其传带疫病的风险概率在0.1%左右。鉴于该疫病在世界各地多发,为防控禽伤寒沙门氏菌传入,应采取严格措施避免输华鸡肉源自感染鸡群。

Isolation and Identification of a Subgroup A Avian Leukosis Virus from Imported Meat-type Grand-parent Chickens

An exogenous avian leukosis virus (ALV) strain SDAU09C1 was isolated in DF-1 cells from one of 240 imported 1-day-old white meat-type grand parent breeder chicks. Inoculation of SDAU09C1 in ALV-free chickens induced antibody reactions specific to subgroup A or B. But gp85 amino acid sequence comparisons indicated that SDAU09C1 fell into subgroup A; it had homology of 88.8%-90.3% to 6 reference strains of subgroup A, much higher compared to other subgroups including subgroup B. This is the first report for ALV of subgroup A isolated from imported breeders.