Histopathological and molecular study of Neospora caninum infection in bovine aborted fetuses

Amir Kamali; HesamAdin Seifi; Ahmad Reza Movassaghi; Gholam Reza Razmi; Zahra Naseri

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Histopathological and molecular study of Neospora caninum infection in bovine aborted fetuses

机译：牛流产胎儿新孢子虫感染的组织病理学和分子研究

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To estimate the extent to which abortion in dairy cows was associated with of Neospora caninum (N. caninum) and to determine the risk factors of neosporosis in dairy farms from 9 provinces in Iran. Methods: Polymerase chain reaction (PCR) test was used to detect Neospora infection in the brain of 395 bovine aborted fetuses from 9 provinces of Iran. In addition, the brains of aborted fetuses were taken for histopathological examination. To identify the risk factors associated with neosporosis, data analysis was performed by SAS. Results: N. caninum was detected in 179 (45%) out of 395 fetal brain samples of bovine aborted fetuses using PCR. Among the PCR-positive brain samples, only 56 samples were suited for histopathological examination. The characteristic lesions of Neospora infection including non-suppurative encephalitis were found in 16 (28%) of PCR-positive samples. The risk factors including season, parity of dam, history of bovine virus diarrhea and infectious bovine rhinotracheitis infection in herd, cow’s milk production, herd size and fetal appearance did not show association with the infection. This study showed that Neospora caused abortion was significantly more in the second trimester of pregnancy than other periods. In addition, a significant association was observed between Neospora infection and stillbirth. Conclusions: The results showed N. caninum infection was detected in high percentage of aborted fetuses. In addition, at least one fourth of abortions caused by Neospora infection. These results indicate increasing number of abortions associated with the protozoa more than reported before in Iran.

机译：估算奶牛流产与犬新孢子虫（N. caninum）相关的程度，并确定伊朗9个省的奶牛场新孢子虫病的危险因素。方法：采用聚合酶链反应（PCR）法检测了来自伊朗9个省的395名牛胎胎儿的脑中新孢子虫感染。此外，还对流产胎儿的大脑进行了组织病理学检查。为了确定与新孢子虫病相关的危险因素，SAS对数据进行了分析。结果：使用PCR技术在395例胎牛胎的胎脑样品中，有179例（占45％）检测到犬新孢子虫。在PCR阳性脑样本中，只有56个样本适合进行组织病理学检查。在PCR阳性样本中有16例（占28％）发现了新孢子虫感染的特征性病变，包括非化脓性脑炎。牛群的季节，坝位，牛病毒性腹泻病史和牛传染性鼻气管炎感染史，牛的产奶量，牛群大小和胎儿外观等危险因素均与感染无关。这项研究表明，新孢子虫引起的流产在妊娠中期比其他时期明显更多。另外，在新孢子虫感染和死产之间观察到显着关联。结论：结果表明，流产的胎儿中检出的犬新孢子虫感染率很高。此外，至少有四分之一的流产是由新孢子虫感染引起的。这些结果表明，与原生动物有关的流产数量比伊朗以前报道的数量更多。

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《亚太热带生物医学杂志（英文版）》 |2014年第12期|990-994|共5页
作者
Amir Kamali; HesamAdin Seifi; Ahmad Reza Movassaghi; Gholam Reza Razmi; Zahra Naseri;
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Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran;

Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran;

Center of Excellence in Ruminant Abortion and Neonatal Mortality, Ferdowsi University of Mashhad, Mashhad, Iran;

Center of Excellence in Ruminant Abortion and Neonatal Mortality, Ferdowsi University of Mashhad, Mashhad, Iran;

Center of Excellence in Ruminant Abortion and Neonatal Mortality, Ferdowsi University of Mashhad, Mashhad, Iran;

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Histopathological and molecular study of Neospora caninum infection in bovine aborted fetuses

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