fowl leukosis virus

例句：

1. 1. Thefowl leukosis virus is responsiblefor the high mortality rate in poultry farms.
   禽白血病病毒是家禽农场高死亡率的原因。
2. 2. Researchers are trying todevelop a vaccine against the fowl leukosis virus.
   研究人员正在尝试开发一种针对禽白血病病毒的疫苗。
3. 3. The fowlleukosis virus has been found tobe highly contagious and can causesevere illness in humans.
   禽白血病病毒被发现具有高度传染性，并能在人类中引起严重疾病。