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首页> 外文期刊>Theriogenology >Evaluation of bovine abortion cases and tissue suitability for identification of infectious agents in California diagnostic laboratory cases from 2007 to 2012
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Evaluation of bovine abortion cases and tissue suitability for identification of infectious agents in California diagnostic laboratory cases from 2007 to 2012

机译：2007年至2012年在加利福尼亚州诊断实验室病例中评估牛流产病例和组织是否适合识别传染原

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Establishing a definitive cause of bovine abortion is a challenging problem faced by veterinary practitioners and diagnosticians. Detection of an infectious or noninfectious source for abortion may facilitate interventions that mitigate future fetal loss in the herd. The purposes of this study were to identify the most common causes of bovine abortion in cases submitted to the California Animal Health and Food Safety Laboratory System, Davis (CAHFS) from 2007 to 2013 and to determine if detection of infectious pathogens differed with the fetal tissue evaluated. Records of 665 bovine abortion cases of 709 animals were reviewed for pathologic diagnoses, test methods used to identify causative conditions, and which tissues yielded successful identification of infectious agents associated with abortion. Over 58% of abortions were attributed to an infectious cause and 46.9% had an infectious agent identified. The most common infectious conditions were Epizootic Bovine Abortion (EBA) (16.2% of all fetuses), other fetal bacterial infections (14.7% of all fetuses), and Neospora caninum (9.3% of all fetuses.) The bacterium associated with EBA (currently named Pajaroellobacter abortibovis) was most commonly identified by immunohistochemistry (IHC) in lymphoid organs (thymus and spleen); N. caninum IHC was most frequently positive in brain, kidney, and placenta. In cases of pathogenic and opportunistic bacterial infections, abomasal samples yielded a significantly greater proportion of definitive aerobic culture results than lung or liver tissues. Direct fluorescent antibody test results for Bovine Viral Diarrhea Virus testing were identical between lung and kidney tissues and nearly identical (96.0%) for Bovine Herpesvirus I. Noninfectious abortive conditions included fetal stress (10.5%), dystocia (3.9%), congenital defects (3.3%), toxicological or mineral problems (1.8%), and death of the cow (1.1%). Just over 20% of the aborted fetuses had no gross or histopathological lesions to explain the abortion. This review highlights the need for submission of critical samples including abomasal contents, lymphoid tissues (thymus, spleen, and lymph nodes), and brain to maximize the diagnosticians' ability to identify causes of abortion. (C) 2016 Elsevier Inc. All rights reserved.
机译：确定牛流产的确切原因是兽医和诊断人员面临的一个难题。对传染性或非传染性流产来源的检测可能有助于减轻将来胎儿在畜群中流失的干预措施。这项研究的目的是确定从2007年到2013年提交给加州戴维斯市动物健康和食品安全实验室系统（CAHFS）的病例中最常见的牛流产原因，并确定传染性病原体的检测是否与胎儿组织不同评估。回顾了709例动物的665例牛流产病例的记录，以进行病理学诊断，用于鉴定病因的测试方法以及哪些组织成功鉴定了与流产相关的传染原。超过58％的流产归因于感染原因，而46.9％的流产被确定为感染因素。最常见的传染病是流行性牛流产（EBA）（占所有胎儿的16.2％），其他胎儿细菌感染（占所有胎儿的14.7％）和犬新孢子虫（占所有胎儿的9.3％）。与EBA相关的细菌（目前）最常通过免疫组织化学（IHC）在淋巴器官（胸腺和脾脏）中鉴定出名为Pajaroellobacter abortibovis的细菌。 N. caninum IHC最常在脑，肾和胎盘中呈阳性。在致病性和机会性细菌感染的情况下，与肺或肝组织相比，与正体有氧培养相比，与正体有氧培养结果相比，有明显的比例。牛和肾组织之间的牛病毒性腹泻病毒检测的直接荧光抗体检测结果相同，而牛疱疹病毒I的直接荧光抗体检测结果几乎相同（96.0％）。非感染性流产条件包括胎儿压力（10.5％），难产（3.9％），先天性缺陷（ 3.3％），毒理或矿物质问题（1.8％）和奶牛死亡（1.1％）。刚刚超过20％的流产胎儿没有肉眼或组织病理学损害来解释流产。这篇评论强调需要提交关键样品，包括血肿内容物，淋巴样组织（胸腺，脾脏和淋巴结）和大脑，以最大程度地提高诊断医生确定流产原因的能力。 （C）2016 Elsevier Inc.保留所有权利。

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