Parasitology Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura35516, Egypt.
Institute for Parasitology, Center for Infection Medicine, University of Veterinary Medicine Hannover, Buenteweg 17, 30559Hanover, Germany.
Parasitology. 2021 Jul;148(8):913-933. doi: 10.1017/S0031182021000536. Epub 2021 Mar 29.
The predator–prey-transmitted cestode Taenia hydatigena infects a wide range of definitive and intermediate hosts all over the world. Domestic and sylvatic cycles of transmission are considered as well. The parasite has considerable economic importance, particularly in sheep. Here, the molecular characters of T. hydatigena cysticerci in sheep from the Nile Delta, Egypt were investigated for the first time. For this purpose, 200 sheep carcasses and their offal were inspected at the municipal abattoir, Dakahlia governorate, Egypt. Cysticerci of T. hydatigena were collected and molecularly characterized employing the mitochondrial 12S rRNA gene. Cysticerci were found in 42 (21%) sheep, mostly attached to the omenti, mesenteries and livers. After molecular confirmation, nine isolates were sequenced displaying six different haplotypes. Analysis of the T. hydatigena 12S rRNA nucleotide sequences deposited in GenBank revealed 55 haplotypes out of 69 isolates, displaying high haplotype (0.797) and low nucleotide (0.00739) diversities. For the Tajima D neutrality index, a negative value (−2.702) was determined, indicating the population expansion of the parasite. Additionally, global data summarized in this study should be useful to set up effective control strategies against this ubiquitous parasite.
食肉类-食草类-中间宿主传播的带绦虫细颈囊尾蚴感染了世界范围内的广泛的终末宿主和中间宿主。也考虑了寄生虫的家养和森林循环传播。该寄生虫具有相当大的经济重要性，特别是在绵羊中。在这里，首次对来自埃及尼罗河三角洲的绵羊中的细颈囊尾蚴的分子特征进行了研究。为此，在埃及达卡利亚省的市屠宰场检查了 200 只绵羊尸体及其内脏。收集细颈囊尾蚴并使用线粒体 12S rRNA 基因进行分子鉴定。在 42 只（21％）绵羊中发现了细颈囊尾蚴，主要附着于大网膜、肠系膜和肝脏上。分子确认后，对 9 个分离株进行了测序，显示了 6 种不同的单倍型。对 GenBank 中存储的细颈囊尾蚴 12S rRNA 核苷酸序列进行分析，发现 69 个分离株中有 55 个单倍型，显示出高单倍型（0.797）和低核苷酸（0.00739）多样性。对于 Tajima D 中性指数，确定了一个负值（-2.702），表明寄生虫种群的扩张。此外，本研究中汇总的全球数据对于制定针对这种普遍存在的寄生虫的有效控制策略应该是有用的。
