avian leukosis

例句：

1. 1. The outbreak of avian leukosis has been causing concern among researchers.
   禽白血病的爆发引起了研究人员的担忧。
2. 2.Avian leukosis is caused by the mutation of the genes responsible for immune function.
   禽白血病是由负责免疫功能的基因突变引起的。
3. 3. Researchers are working to develop treatments for avian leukosis.
   研究人员正在努力开发治疗禽白血病的治疗方法。