Abstract：
Abortions in sheep flocks affect animal health and lead to significant losses in productivity, with severe economic consequences. In recent years, the role of protozoan parasites as the cause of ovine abortions has been significant. Here, the diagnosis of infectious causes of abortions in sheep in Israel in the last decade is reviewed, focusing on parasitic pathogens. Analysis of the serological data of sheep sera (including aborted fetuses) submitted for diagnoses between 2010 and 2019 revealed overall seroprevalence of 67.4 % and 46.7 % for Neospora spp. and Toxoplasma gondii respectively, with high rates of co-exposure (32.4 %). The seroprevalence of T. gondii was higher in aborting ewes than in pre-sale examinations (48.2 % and 28.9 %, respectively (P < 0.001)). The seroprevalence of Neospora spp. was significantly higher than the seroprevalence of Toxoplasma (P < 0.001), and was similar in samples from aborting ewes and in samples from pre-sale examinations. In addition, the presence of anti-Neospora spp. antibodies was the most prominent finding diagnosed in aborted fetuses (22.9 % of aborted fetuses, significantly higher than any other organism, P < 0.001). The results of this study demonstrate that in endemic areas the seroprevalence of N. caninum in sheep may be high, and should be considered as an important cause of abortions. However, since the seroprevalence is high even in non-aborting ewes, in order to determine the causative agent of abortion in endemic flocks, a comprehensive epidemiological investigation is warranted.
摘要：
羊群流产影响动物健康,导致生产力显著下降,带来严重的经济后果。近年来,原生动物寄生虫作为绵羊流产的原因的作用是显著的。这里,回顾了过去十年来以色列绵羊流产的感染性原因的诊断，专注于寄生虫病原体。对2010年至2019年期间提交诊断的绵羊血清（包括流产胎儿）的血清学数据进行的分析显示，新孢子菌属的总体血清阳性率分别为67.4％和46.7％。和弓形虫分别，共同暴露率高(32.4%)。流产母羊的弓形虫血清阳性率高于售前检查（48.2％和28.9％，分别(P<0.001)。新孢子菌属的血清阳性率。显著高于弓形虫血清阳性率(P<0.001),流产母羊的样本和售前检查的样本相似。此外,抗新孢子菌属的存在。抗体是流产胎儿中最突出的诊断结果(22.9%的流产胎儿，显著高于任何其他生物体，P<0.001)。这项研究的结果表明，在流行地区，绵羊中的N.caninum的血清阳性率可能很高，应被视为堕胎的重要原因。然而,由于即使在非流产母羊中血清阳性率也很高，为了确定地方性羊群流产的致病因素，有必要进行全面的流行病学调查。
