Sol J, Schaake J, Leloup M R
Gezondheidsdienst voor Dieren in Overijssel en Flevoland, Zwolle.
Tijdschr Diergeneeskd. 1989 Sep 1;114(17):886-90.
A severe course of a primary BVD infection in a seronegative dairy herd is reported. Approximately one third of the animals was very ill and showed severe diarrhoea, with temperatures varying from 39 degrees C to 41 degrees C. At the time of the outbreak, twenty-four cows had been pregnant for more than three months. Four animals aborted their calves, two mummies were born and two cows were found not to be pregnant at drying off during the next three months following the outbreak. In addition many of the newborn calves were weak and showed relatively low birth weights. The BVD virus was probably introduced into the herd by a purchased calf, which had pneumonia when it arrived on the farm.
据报道，在一个血清学阴性的奶牛群中发生了严重的原发性牛病毒性腹泻（BVD）感染病程。约三分之一的动物病情严重，出现严重腹泻，体温在39摄氏度至41摄氏度之间波动。疫情爆发时，24头母牛已怀孕三个多月。4头动物流产，产下2头木乃伊胎，在疫情爆发后的接下来三个月干奶期时，发现2头母牛未怀孕。此外，许多新生犊牛体弱，出生体重相对较低。BVD病毒可能是由一头购买的犊牛引入牛群的，该犊牛抵达农场时患有肺炎。
