Geurden T, Somers R, Thanh N T G, Vien L V, Nga V T, Giang H H, Dorny P, Giao H K, Vercruysse J
Department of Parasitology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
Vet Parasitol. 2008 May 31;153(3-4):384-8. doi: 10.1016/j.vetpar.2008.01.031. Epub 2008 Feb 3.
In northern Vietnam, dairy cattle are mainly managed in small-scale farms, where animals are kept confined and feeding occurs by cut and carry methods. In the present study the occurrence of parasitic infections was examined in five provinces around Hanoi. A total of 201 farms were visited, and 334 stool and 239 blood samples were collected from calves younger than 3 months, animals between 3 and 24 months and adult cows. Furthermore, 254 milk samples were collected from lactating animals. Coproscopical examination indicated a high prevalence of nematode eggs (Cooperia spp., Haemonchus and Oesophagostomum spp.) in animals (n=176) between 3 and 24 months (66%) and in adult cows (n=90; 54%). In these age groups the prevalence of Fasciola was 28% and 39%, respectively, and for Paramphistomum the prevalence was 78% and 82%, respectively. Fifty percent of the calves younger than 3 months (n=68) were positive for Giardia, and none for Cryptosporidium. Most Giardia isolates were identified as the non-zoonotic G. duodenalis assemblage E on the beta-giardin gene. The blood samples were examined with commercially available Svanovir((R))Elisa's for the presence of Anaplasma marginale and Babesia bigemina specific antibodies, and a prevalence of 28% and 54% was found, respectively. In the milk samples Neospora caninum specific antibodies (Svanovir((R))Elisa) were detected in 30% of the lactating animals. The present study demonstrates that parasitic infections occur frequently in dairy cattle around Hanoi although animals are mainly kept confined, and indicates that further research on the economic impact of these infections is needed.
在越南北部，奶牛主要饲养在小规模农场中，动物被圈养，采用割草并搬运的方式进行喂食。在本研究中，对河内周边五个省份的奶牛寄生虫感染情况进行了调查。共走访了201个农场，从3个月龄以下的犊牛、3至24个月龄的动物以及成年母牛身上采集了334份粪便样本和239份血液样本。此外，还从泌乳动物身上采集了254份牛奶样本。粪便检查表明，3至24个月龄的动物（n = 176；66%）和成年母牛（n = 90；54%）中线虫卵（古柏线虫属、血矛线虫和食道口线虫属）的感染率很高。在这些年龄组中，肝片吸虫的感染率分别为28%和39%，双腔吸虫的感染率分别为78%和82%。3个月龄以下的犊牛（n = 68）中有50%贾第虫检测呈阳性，隐孢子虫检测均为阴性。大多数贾第虫分离株根据β-贾第素基因被鉴定为非人畜共患的十二指肠贾第虫E型。血液样本通过市售的Svanovir® ELISA检测边缘无浆体和双芽巴贝斯虫的特异性抗体，感染率分别为28%和54%。在牛奶样本中，30%的泌乳动物检测到犬新孢子虫特异性抗体（Svanovir® ELISA）。本研究表明，尽管奶牛主要被圈养，但河内周边的奶牛寄生虫感染仍很常见，并表明需要进一步研究这些感染的经济影响。
