Research Unit of Epidemiology and Risk Analysis Applied to Veterinary Sciences (UREAR-ULg), Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium.
Transbound Emerg Dis. 2014 Oct;61(5):469-72. doi: 10.1111/tbed.12047. Epub 2013 Jan 7.
Between late February and May 2012, a preliminary anonym survey was conducted among sheep farmers in south of Belgium in order to contribute to future estimations of the economic losses caused by Schmallenberg virus (SBV). Based on clinical signs consistent with SBV infection, this survey involved 13 meat sheep flocks considered as positive flocks with subsequent SBV detection by RT-qPCR [SBV-positive flocks (PF); total of 961 animals], and 13 meat sheep flocks considered as negative flocks (NF; total of 331 animals). These preliminary results indicated several significant characteristics that were more present in PF than in NF. These include an increased rate of abortions (6.7% in PF versus 3.2% in NF), of lambs born at term but presenting malformations (10.1% in PF versus 2.0% in NF) and of dystocia (10.1% in PF versus 3.4% in NF). Lamb mortality during the first week of life was reported more frequently in PF (8 of 13 PF, 61.5%) than in NF (1 of 13 NF, 7.7%). In PF, the observed prolificacy rate was 2-fold lower (93%) than expected (186%). The implementation of a survey at larger scale, including a high number of breeders, is necessary to allow a more detailed analysis of the SBV impact in the sheep sector.
2012 年 2 月底至 5 月期间，在比利时南部的绵羊养殖户中进行了一项初步的匿名调查，旨在为未来评估沙姆布鲁病毒（SBV）造成的经济损失提供依据。该调查基于与 SBV 感染一致的临床症状，涉及 13 个被认为是阳性羊群的肉用绵羊群，随后通过 RT-qPCR 检测到 SBV（SBV-阳性羊群（PF）；共 961 只动物），以及 13 个被认为是阴性羊群的肉用绵羊群（NF；共 331 只动物）。这些初步结果表明，PF 比 NF 存在更多的显著特征。这些特征包括流产率增加（PF 为 6.7%，NF 为 3.2%）、足月出生但存在畸形的羔羊（PF 为 10.1%，NF 为 2.0%）和难产（PF 为 10.1%，NF 为 3.4%）。PF 中的羔羊在生命的第一周内的死亡率更高（PF 中的 13 个羊群中有 8 个，61.5%），而 NF 中的羔羊死亡率更低（NF 中的 13 个羊群中有 1 个，7.7%）。PF 中的观察繁殖率比预期的低两倍（93%）（186%）。需要在更大范围内实施调查，包括大量的养殖户，以便更详细地分析 SBV 对绵羊行业的影响。
