Animal Pathology Department, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, C. Miguel Servet 177, Zaragoza, 50013, Spain.
Veterinary Faculty, University of Zaragoza, Zaragoza, 50013, Spain.
Vet Res Commun. 2024 Feb;48(1):521-525. doi: 10.1007/s11259-023-10186-y. Epub 2023 Aug 2.
Ovine anaplasmosis is an emerging vector-borne disease in Europe caused by Anaplasma ovis. The infection has spread quickly in recent years, causing moderate to severe outbreaks in sheep flocks, leading to relevant economic losses in sheep farming. This wider spread has been associated with global warming and climate change, favouring the maintenance and life cycle of their main vector, the ticks. However, another epidemiological aspect could favour this quick spread. Long persistence infection of Anaplasma ovis has been proposed as a hypothesis in several articles but never scientifically proven. The results of the present study demonstrate that eight adult sheep, both naturally or experimentally infected, maintain Anaplasma ovis load in blood during their whole productive life (4 to 6 years), being permanently infected. In addition, the results suggest that A. ovis bacterial load can be constant or suffer fluctuations, as has been demonstrated in other Anaplasma species. Both aspects can be determinants in the epidemiology and the transmission of the infection.
绵羊无形体病是一种在欧洲流行的新兴虫媒传染病，由绵羊无形体引起。近年来，该感染迅速传播，导致绵羊群中发生中度至重度暴发，给养羊业造成了相关经济损失。这种更广泛的传播与全球变暖及气候变化有关，有利于其主要媒介蜱的维持和生命周期。然而，另一个流行病学方面可能有利于这种快速传播。绵羊无形体的长期持续感染已在多篇文章中被提出，但从未得到科学证实。本研究的结果表明，8 只成年绵羊，无论是自然感染还是实验感染，在其整个生产寿命（4 至 6 年）期间都能在血液中维持绵羊无形体的载量，从而成为持续性感染。此外，研究结果表明，绵羊无形体的细菌载量可能是恒定的或波动的，就像在其他无形体物种中所证明的那样。这两个方面都可能是感染的流行病学和传播的决定因素。
