Regassa Assefa, Penzhorn B L, Bryson N R
Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, 0110, Onderstepoort, South Africa.
Vet Parasitol. 2003 Oct 30;116(4):267-74. doi: 10.1016/j.vetpar.2003.07.011.
The seroprevalence of Babesia bigemina and Babesia bovis antibodies in non-vaccinated cattle was monitored on a South African ranch. The main objective was to assess the endemic stability to bovine babesiosis in cattle maintained under relaxed tick-control measures. Cattle were bled at the age of 7, 8, 10, 17, 20 and 30-120 months and the sera tested for the presence of antibodies using the indirect fluorescent antibody (IFA) test. None of the animals were positive to B. bovis. Seroprevalence of B. bigemina antibodies was 46, 70, 90, 92, 54 and 82% in the various age classes, respectively. Endemic stability was therefore reached by the time the calves were 9 months old. The high seroprevalence of B. bigemina was probably due to the high vector tick population on the ranch, which would have encouraged frequent transmission of B. bigemina. An endemically stable situation to B. bigemina could therefore be achieved merely by adopting a tick-control method that allows a reasonable number of ticks on cattle rather than relying entirely on intensive tick control and vaccination.
在南非的一个牧场监测了未接种疫苗的牛体内双芽巴贝斯虫和牛巴贝斯虫抗体的血清流行率。主要目的是评估在放松蜱虫控制措施下饲养的牛对牛巴贝斯虫病的地方流行性稳定性。在牛7、8、10、17、20和30至120月龄时采血，并用间接荧光抗体（IFA）试验检测血清中抗体的存在。没有动物对牛巴贝斯虫呈阳性。在不同年龄组中，双芽巴贝斯虫抗体的血清流行率分别为46%、70%、90%、92%、54%和82%。因此，在犊牛9月龄时达到了地方流行性稳定。双芽巴贝斯虫的高血清流行率可能是由于牧场中媒介蜱虫数量众多，这会促使双芽巴贝斯虫频繁传播。因此，仅通过采用一种允许牛身上有合理数量蜱虫的蜱虫控制方法，而不是完全依赖强化蜱虫控制和疫苗接种，就可以实现对双芽巴贝斯虫的地方流行性稳定状态。
