Jacobsen P
Trop Anim Health Prod. 1983 Feb;15(1):43-6. doi: 10.1007/BF02250761.
Crossbred and zebu calves at 4 to 5 months of age in an area where tick control was carried out showed little difference in mortality. Crossbred calves at 10 months of age had a mortality rate of 20% from all causes, 14% from East Coast fever. Serological results plus mortality studies showed that the survival rate of crossbred calves known to have been exposed to ECF was 57%. Serological results further showed that, in spite of tick exposure, only 26% of the crossbreds had seroconverted at 10.3 months of age while 15% zebus had positive titres.
在进行蜱虫控制的地区，4至5月龄的杂交犊牛和瘤牛犊牛的死亡率几乎没有差异。10月龄的杂交犊牛因各种原因导致的死亡率为20%，因东海岸热导致的死亡率为14%。血清学结果加上死亡率研究表明，已知接触过东海岸热的杂交犊牛的存活率为57%。血清学结果进一步表明，尽管接触了蜱虫，但只有26%的杂交犊牛在10.3月龄时发生了血清转化，而15%的瘤牛有阳性滴度。
