Miller Sean M
Summerveld Equine Hospital, Durban.
J S Afr Vet Assoc. 2020 Jul 7;91(0):e1-e6. doi: 10.4102/jsava.v91i0.1983.
Otobius megnini has been associated with certain clinical conditions in horses in both California and Mexico. A number of cases similar to those described previously have been identified by the author in South Africa. This case report summarises these cases to demonstrate that the clinical condition occurs readily in South Africa and may be increasing in occurrence. The disease has minimal coverage in the literature making it more likely that a veterinarian, unfamiliar with the disease, will miss the diagnosis. The author would like to make veterinarians aware of this as a potential differential diagnosis. This study is a retrospective review of clinical data. Clinical records of patients with similar clinical signs and treatment were reviewed and grouped together as relevant cases for this case report. Ten cases of O. megnini associated neuromuscular dysfunction are reported, suggesting a link between the occurrence of the tick and the clinical condition. Clinical signs include third eyelid prolapse, localised muscle fasciculations, elevated heart rate and limb stamping. Serum chemistry changes commonly show increased aspartate aminotransferase and creatine kinase enzymes activities. The occurrence of the ticks within South Africa and the increasing number of cases presented demonstrate the need for more investigation into the pathophysiology of this condition.
在加利福尼亚州和墨西哥，墨西哥钝缘蜱（Otobius megnini）都与马匹的某些临床病症有关。作者在南非也发现了一些与之前描述的病例相似的情况。本病例报告总结了这些病例，以证明这种临床病症在南非很容易发生，而且发病率可能正在上升。该疾病在文献中的报道很少，这使得不熟悉该疾病的兽医更有可能漏诊。作者希望让兽医们意识到这是一种潜在的鉴别诊断。本研究是对临床数据的回顾性分析。对具有相似临床症状和治疗情况的患者临床记录进行了审查，并将其归为该病例报告的相关病例。报告了10例与墨西哥钝缘蜱相关的神经肌肉功能障碍病例，表明蜱的出现与临床病症之间存在联系。临床症状包括第三眼睑脱垂、局部肌肉抽搐、心率加快和肢体跺地。血清化学变化通常显示天冬氨酸转氨酶和肌酸激酶酶活性升高。南非境内蜱的出现以及所呈现病例数量的增加表明，有必要对这种病症的病理生理学进行更多研究。
