Bezuidenhout J D, Spickett A M
Onderstepoort J Vet Res. 1985 Dec;52(4):269-71.
Two groups of calves were respectively immunized with heartwater blood (BV) and ground-up tick suspension (GUTS) vaccine. A third group was left unimmunized as controls. No difference in the immune status conferred could be demonstrated between the 2 vaccines at 6 months and 12 months challenge after vaccination. An index, based on the rectal temperature before and during the reaction, was calculated as an aid in evaluating the data. In practice, the evaluation of heartwater vaccination by challenge is more effective at 12 months than at 6 months after vaccination. No effective difference was demonstrated between the 2 vaccines in their immunizing efficacy.
两组小牛分别用牛心水血液（BV）疫苗和蜱研磨悬液（GUTS）疫苗进行免疫。第三组未免疫作为对照。在接种疫苗后6个月和12个月进行攻毒时，两种疫苗在赋予的免疫状态方面未显示出差异。根据反应前和反应期间的直肠温度计算出一个指数，以辅助评估数据。实际上，通过攻毒评估牛心水疫苗接种情况在接种后12个月比6个月时更有效。两种疫苗在免疫效力方面未显示出有效差异。
