Occurrence of Paratanaisia confusa Freitas, 1951 in free-living guira cuckoo (Guira guira, Cuculiformes: Crotophagidae)

Abstract This report presents a description of natural infection of an adult free-living guira cuckoo with Paratanaisia confusa. Histological and morphological evaluations of renal and parasite samples were performed. The morphological analysis of the parasites revealed spiny tegument, characteristic of P. confusa helminthes. Although macroscopic alterations were absent in the kidneys, the histopathology revealed parasites inside the collecting ducts causing dilatation and destruction of the lining epithelial cells in addition to small focal inflammatory infiltrates in the renal parenchyma. However, as the bird was free-living and naturally infected it was not possible to confirm if all these alterations were directly caused by the parasite presence or if they were related to causes other than the parasitism. Nonetheless, such findings indicate that these trematodes may have pathogenic potential in this host.

摘要：本报告记述了1例成年野生圭拉鹃（Guira Cuckoo）自然感染副塔尼吸虫（Paratanaisia confusa）的病例。研究人员对肾脏样本及寄生虫样本开展了组织学与形态学检测。寄生虫形态学分析显示，其体被具棘状结构，符合副塔尼吸虫（P. confusa）蠕虫的典型特征。尽管肾脏未出现肉眼可见的大体病变，但组织病理学检查发现，集合管内存在寄生虫，引发管壁上皮细胞扩张与破坏，同时肾实质内可见局灶性炎性浸润。由于该个体为野生自然感染个体，无法确认上述病变是否均由寄生虫感染直接导致，亦不能排除其他非寄生性诱因的可能。尽管如此，本次研究结果仍提示，此类吸虫在该宿主中可能具备致病潜力。