Sandals W C, Povey R C, Meek A H
Department of Population Medicine, Ontario Veterinary College, University of Guelph, Ontario.
Can J Vet Res. 1995 Apr;59(2):81-6.
Studies were conducted to determine prevalence and dynamics of bovine parvovirus (BPV) infection. Dairy cows from 29 randomly selected herds in southwestern Ontario were tested twice, one year apart, for the presence of hemagglutination inhibition (HI) antibodies against BPV. Fifty-one percent of 1141 cows tested had BPV-HI titers > 1:32. One year later, the seroprevalence was 83% in 1131 cows from the same farms. The herd mean seroprevalence was 49% and 86% for the year-1 and year-2 samples, respectively. Evidence of BPV infection was found in 96% (27/28) of herds in year-1 and 100% of herds in year-2. A comparison of titers from 716 cows tested twice showed evidence of frequent BPV infection. Sixty-two percent of 326 animals selected in a systematic manner from 40 Guelph area dairy farms had BPV-HI titers > 1:32. The herd mean seroprevalence was 64% Two herds had no animals with titers above the critical titer (1:32) while in one-quarter of the herds all animals exceeded the critical titer.
开展了多项研究以确定牛细小病毒（BPV）感染的流行情况和动态变化。对安大略省西南部随机选取的29个牛群中的奶牛进行了两次检测，间隔一年，检测针对BPV的血凝抑制（HI）抗体的存在情况。在检测的1141头奶牛中，51%的奶牛BPV-HI效价>1:32。一年后，来自相同农场的1131头奶牛的血清阳性率为83%。第一年和第二年样本的牛群平均血清阳性率分别为49%和86%。在第一年96%（27/28）的牛群以及第二年100%的牛群中发现了BPV感染的证据。对716头奶牛进行的两次检测的效价比较显示出频繁的BPV感染迹象。从圭尔夫地区40个奶牛场以系统方式选取的326头动物中，62%的动物BPV-HI效价>1:32。牛群平均血清阳性率为64%。有两个牛群没有效价高于临界效价（1:32）的动物，而在四分之一的牛群中所有动物都超过了临界效价。
