Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease.
用于食用的牛和鸡经常被喂食会传播病毒的饲料，该病毒引起这种疾病。
2
The gypsy moth is also subject to attack by the nucleopolyhedrosis virus, or wilt disease, a particularly important killer of the caterpillars in outbreak years.
舞毒蛾还会受到核多角体病毒或萎蔫病的攻击，在毛虫爆发的年代，这是一种特别重要的杀手。
3
The virus was first identified in the State Serum Institute in Copenhagen, Denmark, in 1958 during an investigation into a pox-like disease among monkeys.