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Studies on the Pathogenicity of Newcastle Disease Virus Isolates in Guinea Fowl

机译：豚鼠新城疫病毒分离株的致病性研究

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摘要

Newcastle disease viruses isolated from chickens and guinea fowl were characterized as viscerotropic, velogenic strains on the basis of their mean death time, intracerebral pathogenicity index, intravenous pathogenicity index and cloacal and conjunctival mean death time. The pathogenesis of the disease caused by both the strains was studied in 4-week-old guinea fowl. Both strains had an incubation period of 5 days and the birds showed dullness, depression, anorexia, diarrhoea and paralysis of the legs. They also exhibited nervous signs such as incoordination, muscle tremors and trembling of the neck at the advanced stage of the disease. Mortality reached 52% in the group infected with the chicken isolate but it was only 8% in the birds infected with the guinea fowl isolate. No specific changes were observed at post-mortem examination except haemorrhages at the tip of the glands of the proventriculus and in the caecal tonsil. Changes in the lymphoid organs and brain were always present in both the groups. Despite the low mortality, the guinea fowl isolated had multiplied in various organs in the birds. In both groups, the frequency of virus isolation increased from 5 to 10 days post infection.
机译：从鸡和珍珠鸡中分离出的新城疫病毒根据其平均死亡时间，脑内致病性指数，静脉内致病性指数以及泄殖腔和结膜平均致死时间被定性为内脏致死型毒株。在4周龄的珍珠鸡中研究了由两种菌株引起的疾病的发病机理。两种品系的潜伏期均为5天，禽类表现出呆滞，抑郁，厌食，腹泻和腿部麻痹。在疾病的晚期，它们还表现出神经症状，例如不协调，肌肉震颤和脖子发抖。在感染鸡分离株的人群中死亡率达到52％，但是在感染了珍珠鸡分离株的鸟类中死亡率仅为8％。尸检后未观察到任何具体变化，除了在前胃腺的腺体顶端和盲肠扁桃体中有出血。两组中总是存在淋巴器官和大脑的变化。尽管死亡率低，但分离出的珍珠鸡在鸟类的各个器官中却成倍增加。在两组中，病毒分离的频率从感染后的5天增加到10天。

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