The persistence of Brucella abortus infection in calves: a retrospective study of heavily infected herds
The persistence of Brucella abortus infection in calves: a retrospective study of heavily infected herds
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犊牛流产布鲁氏菌感染的持续性：对严重感染牛群的回顾性研究
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
J. Wilesmith
中科院分区：
文献类型：
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作者：
J. Wilesmith
对在布氏菌根除计划的头三年被屠宰的170个畜群进行回顾性调查发现，在所有动物都被屠宰的115个畜群中，除了重新饲养进口动物的畜群外，没有出现后续故障。在仅屠宰成年牛的46个畜群中，有11个畜群出现了崩溃。在这11个畜群中，有10个畜群的再感染源可能是缓刑的小母牛。在这10个畜群的11个初始反应堆中，已知有7个是反应堆水坝的后代，1个是血清学阴性的水坝出生的，另外3个没有确定水坝。在最初的11个反应中，6个可能在青春期之前的任何时间获得感染，但在5个病例中，感染只能在子宫内或婴儿期早期获得。据估计，在英国根除计划的情况下，有2.52%的血清学阳性的小牛在成年早期产生反应的危险，从而对重新建立的畜群构成危险。
A retrospective inquiry into 170 herds which were slaughtered in the first three years of the brucella eradication scheme found that in the 115 herds where all animals were slaughtered there were no subsequent breakdowns, other than in herds which were restocked with imported animals. In the 46 herds in which only the adult stock were slaughtered, 11 herds suffered breakdowns. In 10 of these 11 herds the sources of reinfection were possibly reprieved heifers. Seven out of the 11 initial reactors in these 10 herds were known to be offspring of reactor dams, one was born of a serologically negative dam and in the other three cases the dams were not identified. Out of the 11 initial reactors, six could have acquired infection at any time up to and including puberty, but in five cases infection could only have been acquired in utero or in early calfhood. It is estimated that under the circumstances of the British eradication scheme there is a risk of 2.52 per cent of heifer calves born of serologically positive dams reacting in early adulthood and thus constituting a risk to the re-established herds.