Mascarenhas Carolina S, Müller Gertrud, de Macedo Márcia Raquel P, Henzel Ana Beatriz D, Robaldo Ricardo B, Corrêa Fabiano
Laboratório de Parasitologia de Animais Silvestres, Instituto de Biologia, Universidade Federal de Pelotas, Campus Universitário, caixa postal: 354, CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil.
Laboratório de Parasitologia de Animais Silvestres, Instituto de Biologia, Universidade Federal de Pelotas, Campus Universitário, caixa postal: 354, CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil.
Vet Parasitol Reg Stud Reports. 2019 Apr;16:100274. doi: 10.1016/j.vprsr.2019.100274. Epub 2019 Feb 20.
Brazil stands out by the diverse records of Dioctopphyme renale in different hosts; however, there is little information about the life cycle of the nematode in the region. This study aims to report on third-stage larvae infections in fish in southern Brazil. In this context, 324 fish of different species belonging to Characiformes, Cyprinodontiformes and Siluriformes were collected in an urban area of Rio Grande do Sul State, where domestic and wild hosts were reported with the nematode. Of the total fish examined, 25(7.7%) were found to be parasitized by third-stage larvae of D. renale which were found encysted in the stomach serous membrane and in the celoma cavity of Hoplosternum littorale (Siluriformes) with a prevalence of 53.2% (25/47) and mean intensity of infection of 4.4 larvae/host (1 to 13 larvae). The occurrence of larvae in H. littorale indicates the presence of parasitosis in the region; however, the contribution of this fish species as a source of infection for dogs in urban areas must be considered with caution given the difficulties these dogs may face in the capture and predation of the fish to the point of effectively maintaining the urban cycle of D. renale. In addition, the low level of larvae registered in the total sample of fish examined indicates that these hosts are unlikely to play an important role in the transmission of D. renale to domestic animals in the region of the study.
巴西因肾膨结线虫在不同宿主中的多样记录而引人注目；然而，关于该线虫在该地区的生命周期的信息却很少。本研究旨在报告巴西南部鱼类的第三期幼虫感染情况。在此背景下，在南里奥格兰德州的一个市区收集了324条属于脂鲤目、鲤齿目和鲇形目的不同种类的鱼，该市区曾报告有家养和野生宿主感染该线虫。在所检查的全部鱼类中，发现25条（7.7%）被肾膨结线虫的第三期幼虫寄生，这些幼虫被发现在细纹半鲇（鲇形目）的胃浆膜和体腔中形成包囊，感染率为53.2%（25/47），平均感染强度为4.4条幼虫/宿主（1至13条幼虫）。细纹半鲇中幼虫的出现表明该地区存在寄生虫病；然而，鉴于城市地区的狗在捕获和捕食这种鱼时可能面临困难，以至于难以有效维持肾膨结线虫的城市传播循环，因此必须谨慎考虑这种鱼类作为城市地区狗的感染源的作用。此外，在所检查的鱼类总样本中记录到的幼虫水平较低，这表明这些宿主在研究区域内不太可能在肾膨结线虫向家畜的传播中发挥重要作用。
