Arsov R, Ivanov I, Sizov I
Vet Med Nauki. 1980;17(8):25-30.
Through a skin-allergic reaction were subjected to a study cattle of different ages (calves-sucklings, growing calves and grown up calves), originating from 4 different from the epizootic point of view cow-farms--one latent focus, two foci with an apparent infection and one cow-farm in good health conditions. On the healthy cow-farm the skin-allergic reaction and the virus neutralizing reaction were not marked. On the farms affected with latent infection and with manifestation of abortions with cows, the skin-allergic reaction with calves till the age of 3 months was negative, whereas the virus neutralizing reaction was usually positive; with the calves at the age of about 6 months the skin-allergic reaction began slightly to become positive. The virus neutralizing reaction was also positive. With the grown up animals both reactions were positive. In the development of recently brought clinical infection among the calves, without affecting their mothers, both reactions were negative with newly born calves, whereas from the second month onward, they began to become positive.
通过皮肤过敏反应，对来自4个从流行病学角度来看不同的奶牛场（一个潜在疫源地、两个有明显感染的疫源地和一个健康状况良好的奶牛场）的不同年龄（犊牛——哺乳犊牛、生长犊牛和成年犊牛）的牛进行了研究。在健康的奶牛场，皮肤过敏反应和病毒中和反应不明显。在受潜在感染影响且母牛有流产表现的农场，3个月龄以下犊牛的皮肤过敏反应为阴性，而病毒中和反应通常为阳性；约6个月龄的犊牛，皮肤过敏反应开始略显阳性。病毒中和反应也呈阳性。成年动物的这两种反应均为阳性。在犊牛中近期出现的临床感染发展过程中，在未感染其母亲的情况下，新生犊牛的这两种反应均为阴性，而从第二个月起，它们开始变为阳性。
