肉鸽新城疫强毒的分离与鉴定

Isolation and Identification of a high Rirulent Newcastle disease virus Stain in Pigeon

从山东地区发病的肉鸽群中分离到一株新城疫病毒,经测定,其鸡胚半数致死量(ELD50)为107.8,10日龄鸡胚平均致死时间(MDT)为52.5h,1日龄雏鸡脑内接种致病指数(ICPI)为1.8,6周龄幼鸡静脉接种致病指数(IVPI)为2.2,证明该NDV为强毒。将该病毒回归非免疫肉鸽,能产生典型的新城疫症状与病变。

One Newcastle disease virus（NDV） isolated from flesh pigeon of shandong was determined as a velogenic strain by chicken embryo half-lethal dose（ELD50） of 10^7.8,the mean death time（MDT） of 52.5h, the intracerebral pathogenicity index（ICPI） of 1.8, and the intravenous pathogenicity index （IVPI） of 2.2.After the NDV was injected into non-immunizing flesh pigeon, typical symptom and pathological changes was found.