Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Republic of Korea.
College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea.
Acta Trop. 2019 Nov;199:105113. doi: 10.1016/j.actatropica.2019.105113. Epub 2019 Jul 26.
Giardia duodenalis (syn. G. intestinalis, G. lamblia), a protozoan parasite that infects most mammals (including humans), has recently been classified into eight different groups/assemblages (A to H) based on host range and genetic characteristics. Assemblages A and B have been reported in humans and in many other animals, including dogs. This study analyzed Giardia infections, implementing multilocus genotyping, including the 18S rRNA, gdh, and β-giardin genes, in sheltered, companion, and special-purpose dogs throughout Korea. Of 640 dog stool samples, 99 (15.5%) were G. duodenalis-positive; this prevalence was similar to that previously reported in Korean calves. In addition, the prevalence was significantly higher in the southern region, and lower in non-sheltered dogs, older dogs, and in the autumn season. Phylogenetic analysis revealed that all G. duodenalis-positive samples belonged to assemblages C and D. Although no G. duodenalis assemblages A and B (mainly found in humans) were identified in this study, assemblage C was detected in the main types of dogs in contact with humans. Assemblage C, thought to be dog-specific, was recently identified in humans. As Giardia (including zoonotic assemblages) is distributed throughout Korea, dog living environments and the potential for dog-human transmission should be monitored.
十二指肠贾第鞭毛虫（同义词：G. 肠型，G. 蓝氏贾第鞭毛虫），一种感染大多数哺乳动物（包括人类）的原生动物寄生虫，最近根据宿主范围和遗传特征被分为八个不同的组/集合（A 到 H）。集合 A 和 B 已在人类和许多其他动物中报告，包括狗。本研究通过实施多位点基因分型，包括 18S rRNA、gdh 和 β- 贾第虫基因，分析了韩国庇护所、伴侣和特殊用途犬中的贾第虫感染。在 640 份狗粪便样本中，有 99 份（15.5%）为十二指肠贾第鞭毛虫阳性；这一流行率与韩国小牛中以前报道的相似。此外，在南部地区的流行率较高，在非庇护所犬、老年犬和秋季的流行率较低。系统发育分析显示，所有十二指肠贾第鞭毛虫阳性样本均属于集合 C 和 D。虽然本研究未鉴定出集合 A 和 B（主要在人类中发现），但在与人类接触的主要犬种中检测到了集合 C。被认为是犬特异性的集合 C 最近在人类中被发现。由于贾第虫（包括人畜共患病集合）分布在韩国各地，应监测狗的生活环境和狗与人之间的传播潜力。
