马里兰州一个封闭奶牛群中犬新孢子虫感染的血清学调查：按生产组划分的血清学反应风险

Serologic survey of Neospora caninum infection in a closed dairy cattle herd in Maryland: risk of serologic reactivity by production groups.

作者信息

Dyer R M, Jenkins M C, Kwok O C, Douglas L W, Dubey J P

机构信息

Virginia/Maryland Regional College of Veterinary Medicine, University of Maryland Campus, 8075 Greenmeade Drive, College Park, MD 20742-3711, USA.

出版信息

Vet Parasitol. 2000 Jun 27;90(3):171-81. doi: 10.1016/s0304-4017(00)00253-3.

DOI:10.1016/s0304-4017(00)00253-3

PMID:10841997

Abstract

Prevalence of antibodies to Neospora caninum was determined in a cross-sectional consensus survey of 1029 bovines in a dairy herd with endemic Neospora-induced abortion. Sera were screened by indirect fluorescent antibody test (IFAT). The prevalence of N. caninum antibody in the IFAT was 17.9% in 107 neonates, 26.2% in 233 yearling heifers and steers, 39.07% in 218 mature heifers, and 26.9% in 465 milking cows. Serologic reactivity was associated with production grouping on the farm with the greatest risk of serologic reactivity appearing in the yearling and mature heifers. There was an increasing risk of serologic reactivity with increasing age only in the parity one and greater animals in the herd. Castrated males were at half the risk of similarly aged females of possessing antibodies to N. caninum. There was no clear relationship between the serologic status of dams and offspring.

摘要

在一项针对某奶牛场1029头奶牛的横断面共识调查中，测定了犬新孢子虫抗体的流行情况。该奶牛场存在由新孢子虫引起的地方性流产。血清通过间接荧光抗体试验（IFAT）进行筛查。在IFAT中，107头新生犊牛的犬新孢子虫抗体流行率为17.9%，233头一岁育成母牛和公牛的流行率为26.2%，218头成年母牛的流行率为39.07%，465头泌乳奶牛的流行率为26.9%。血清反应性与农场的生产分组相关，血清反应性风险最高的是一岁育成母牛和成年母牛。仅在牛群中头胎及以上年龄的动物中，血清反应性风险随年龄增长而增加。去势雄性感染犬新孢子虫抗体的风险是同龄雌性动物的一半。母体和后代的血清学状态之间没有明显关系。