Du Plessis J L, Van Gas L
Veterinary Research Institute, Onderstepoort.
Onderstepoort J Vet Res. 1989 Sep;56(3):185-8.
Nineteen per cent and 32% of serologically positive sheep and goats in heartwater endemic areas of the Republic of South Africa were susceptible to challenge with, respectively, the Ball 3 and Welgevonden stocks of Cowdria ruminantium. There was good correlation between the results of the indirect fluorescent antibody test and immunity, since without exception all the seronegative animals reacted when they were challenged. The fact that only 74% of the seropositive sheep and goats were immune to challenge can probably be ascribed to the poor cross-protection between stocks of C. ruminantium and not to false positive serological reactions.
在南非共和国心水病流行地区，血清学检测呈阳性的绵羊和山羊中，分别有19%和32%对反刍兽考德里氏体的Ball 3株和韦尔格温登株攻击敏感。间接荧光抗体试验结果与免疫力之间存在良好的相关性，因为所有血清学阴性的动物在受到攻击时无一例外都有反应。血清学阳性的绵羊和山羊中只有74%对攻击具有免疫力，这一事实可能归因于反刍兽考德里氏体不同毒株之间交叉保护作用较差，而不是血清学反应出现假阳性。
