Objective : borna disease virus ( bdv ) is a neurotropic nonsegmented negative - stranded rna virus that caused the illness calling borna disease ( bd ) . the illness is a nervous syndrome characterized by profound behavirol and consciousness abnormalities as well as encephalitis 目的：博尔纳病病毒( bornadiseasevirus ， bdv )是一种嗜神经性、非节段性、负股单链的rna病毒。
2.
In 1932 , outbreaks of a disease causing neurotropic dysfunction in young chickens in the new england region of the usa in 1930 were first reported by jones . over the next decade , outbreaks of the disease were reported in europe , canadajapan and australia . in 1980s , the disease was transmited into china 1932年jones首次报道了在1930年美国新英格兰地区幼鸡群爆发的禽脑脊髓炎。随后十年中，在欧洲、加拿大、日本和澳大利亚都有此病的报道。
3.
Avian encephalomyelitis virus ( aev ) is a picornavirus with a predilection for the central nervous system and other parenchymous organs of chickens that is transmited by the oral - faecal route . the virus may be spread by the vertical and horizontalroutes , and because of its great stability , contaminated areas may remain infectious for long periods . the egg - adapted van roekel strain is highly neurotropic and does not grow efficiently in the enteric tract of the chicken , and the field isolates of aev is usually enterotropic . despite this . the virion polypeptides of both naturally - occurring strains and the van roekel strain are antigenically identical 侵害鸡的中枢神经系统和其它实质性器官，该病毒通过口-粪途径传播，具有水平和垂直传播的能力。由于它极大的稳定性，被污染的区域可能长期保持传染性。鸡胚适应株vanroekel是高度嗜神经的，并且在鸡的肠道内不能有效的生长，而野毒株却是嗜肠道型的。
