Centre for Fish and Wildlife Health, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
Swiss Ornithological Institute, Sempach, Switzerland.
Transbound Emerg Dis. 2020 Nov;67(6):3056-3060. doi: 10.1111/tbed.13719. Epub 2020 Jul 25.
Transmission paths in the distribution of proliferative kidney disease (PKD) of salmonids are still largely unknown. In this study, the role of goosander (Mergus merganser) as possible transport host for Tetracapsuloides bryosalmonae through faeces was examined. Goosander fledglings were fed exclusively with diseased brown trout (Salmo trutta fario). In all trout used for feeding, intratubular sporogonic stage of the parasite was confirmed histologically. Between one to 10 hours post-feeding, the goosander faeces were sampled and tested for T. bryosalmonae DNA. In qPCR, only DNA fragments were found, and in conventional PCR, no amplification was confirmed. Therefore, we hypothesize that the role of goosander as transport hosts for T. bryosalmonae via their faeces can be neglected.
鲑鱼多囊肾病（PKD）的传播途径在很大程度上仍不清楚。在这项研究中，我们研究了斑头秋沙鸭（Mergus merganser）是否可能通过粪便将四包微孢子虫（Tetracapsuloides bryosalmonae）传播给其他鱼类。斑头秋沙鸭的雏鸟被专门喂食患有多囊肾病的褐鳟（Salmo trutta fario）。在所有用于喂食的鳟鱼中，寄生虫的肠内孢子生殖阶段均通过组织学得到确认。在喂食后 1 至 10 小时之间，采集斑头秋沙鸭的粪便并检测 T. bryosalmonae DNA。在 qPCR 中，仅发现了 DNA 片段，而在常规 PCR 中，则未确认扩增。因此，我们假设斑头秋沙鸭通过粪便传播 T. bryosalmonae 的作用可以忽略不计。
