Tanaka Saki, Takimoto Haruka, Matsubara Yuki, Tsujimoto Tsunenori, Sasaki Jun
School of Veterinary Medicine, Iwate University, 3-18-8 Ueda, Morioka 020-8550, Japan.
Morioka Zoological Park ZOOMO, Morioka 020-0803, Japan.
Vet Sci. 2025 Aug 25;12(9):806. doi: 10.3390/vetsci12090806.
A zoo-housed alpaca was found recumbent with profuse frothy salivation and an inability to stand. Supportive treatment, including intravenous fluid therapy via the jugular vein and oral administration of activated charcoal, was initiated. Despite these interventions, the animal's condition progressively worsened, with clinical signs including vomiting and neurological manifestations such as paddling movements and opisthotonus. The alpaca died approximately 4 h after discovery by first observation of clinical signs. Necropsy revealed a large volume of white, foamy fluid present in the tracheal and bronchial lumens. The lungs were dark red and markedly congested and edematous throughout all lobes. Multiple ecchymotic hemorrhages were observed on the mucosal surface of the pyloric region of the third compartment of the stomach and on the serosal surface of the duodenum. Histopathological examination revealed severe pulmonary congestion and edema, along with marked congestion of the liver, spleen, and kidneys. The gastric contents were green and contained plant material, including ten leaves morphologically identified as Japanese pieris (). Postmortem inspection of the enclosure revealed the presence of Japanese pieris shrubs with evidence of browsing. Based on these findings, acute poisoning from ingestion of Japanese pieris was diagnosed.
一只圈养在动物园的羊驼被发现卧地不起，伴有大量泡沫状唾液分泌且无法站立。随即开始进行支持性治疗，包括通过颈静脉进行静脉输液治疗以及口服活性炭。尽管采取了这些干预措施，该动物的病情仍逐渐恶化，出现了呕吐以及划水动作和角弓反张等神经学表现等临床症状。这只羊驼在首次出现临床症状后约4小时死亡。尸检发现气管和支气管腔内有大量白色泡沫状液体。肺部呈暗红色，所有肺叶均明显充血和水肿。在胃第三部分的幽门区域黏膜表面和十二指肠浆膜表面观察到多处瘀斑性出血。组织病理学检查显示严重的肺充血和水肿，同时肝脏、脾脏和肾脏也有明显充血。胃内容物呈绿色，含有植物材料，包括十片经形态学鉴定为日本马醉木（Pieris japonica）的叶子。对围栏进行死后检查发现有日本马醉木灌木，并有被啃食的迹象。基于这些发现，诊断为因摄入日本马醉木而导致的急性中毒。
