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首页> 外文期刊>Tropical Animal Health and Production >Virus neutralization technique as a tool to evaluate the virological profile for bovine viral diarrhea virus infection in dairy water buffalo (Bubalus bubalis) herds
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Virus neutralization technique as a tool to evaluate the virological profile for bovine viral diarrhea virus infection in dairy water buffalo (Bubalus bubalis) herds

机译：病毒中和技术作为评估牛奶水牛（Bubalus Bubalis）牛群牛病毒腹泻病毒感染病毒学剖面的工具

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Serological evidence shows that the bovine viral diarrhea virus (BVDV) infections are present in Brazilian dairy and beef water buffalo herds. As few reports describe the BVDV infection profile the aim of this study was to evaluate the dynamics of BVDV circulation in Brazilian dairy water buffalo herds through analysis of the seropositivity rate and the titer range of anti-BVDV neutralizing antibodies in a group of animals that are considered sentinels. Blood samples (n = 305) were obtained from unvaccinated, asymptomatic young water buffalos from four dairy herds randomly identified as A (n = 106), B (n = 62), C (n = 119), and D (n = 18). The detection and titration of anti-BVDV neutralizing antibodies were evaluated by the virus neutralization test according to the World Organization for Animal Health. Analysis of the results revealed two distinct epidemiological conditions. The first is represented by herds A and C where high rates of seropositive animals (A = 39.6%; C = 51.3%) and high and very variable antibodies titers suggested active BVDV infection. The other condition is represented by herds B and D with low rates of seropositive animals (B = 8.1%; D = 11.1%) and low and little variable antibodies titers suggesting an epidemiological condition of infection stability. Some variables were observed in herds with a distinct BVDV infection profile. Herds with active infection were big, open herds, and had more management practices. In contrast, the herds with infection stability were small, closed herds with few management practices. These results highlight the importance of evaluation, monitoring, and control of BVDV infection also in dairy water buffalo herds.
机译：血统证据表明，巴西乳制品和牛肉水牛牛群中存在牛病毒腹泻病毒（BVDV）感染。由于少数报告描述了BVDV感染分析本研究的目的是通过分析一组动物中的血清阳性率和抗BVDV中和抗体的血清阳性率和滴度范围来评估巴西乳制品水牛群的BVDV循环动态。考虑了哨兵。从未被鉴定为（n = 106），b（n = 62），c（n = 119），d（n = 18 ）。根据世界组织进行动物健康的病毒中和试验，评估抗BVDV中和抗体的检测和滴定。结果分析显示出两个不同的流行病学条件。首先是由群A和C代表，其中血清阳性动物的高速率（a = 39.6％; c = 51.3％）和高且非常可变的抗体滴度表明活性BVDV感染。另一种条件是由群B和D表示，血清阳性动物的低速率（b = 8.1％; d = 11.1％），低且小的可变抗体滴度，表明感染稳定性的流行病学条件。在群中观察到一些不同的BVDV感染曲线。患有活跃感染的群体大，开放的牛群，并有更多的管理措施。相比之下，具有感染稳定性的群体小，封闭群，管理实践很少。这些结果突出了在乳制品水牛群中的评估，监测和控制BVDV感染的重要性。

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