STUDIES ON FAILURE OF T-STRAIN LIVE BABESIA-BOVIS VACCINE

被引:48
作者
BOCK, RE
DEVOS, AJ
KINGSTON, TG
FRASER, IR
机构
[1] ANIM RES INST,YEERONGPILLY,QLD 4105,AUSTRALIA
[2] QUEENSLAND DEPT PRIMARY IND,MARYBOROUGH,QLD 4650,AUSTRALIA
关键词
D O I
10.1111/j.1751-0813.1995.tb03558.x
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Field Investigations of the protection afforded by the Australian live Babesia bovis vaccine used in the early 1990s (T strain) revealed inadequate vaccine-induced protection in certain herds. Vaccination/challenge trials using 207 experimental cattle were conducted to evaluate the protection afforded by T strain B bovis against field isolates from these herds. The trials investigated whether isolates that could 'breakthrough' T strain immunity were present in the field, the ability or inability of specific cattle to develop protective immunity after vaccination with T strain and the effect of attenuation and maintenance procedures on the immunogenicity of T strain. The results showed that B bovis parasites present early in the process of attenuation of T strain were more protective than those remaining late in the process. They also showed that cattle from properties experiencing vaccine failures were less protected by T strain vaccination than Bos taurus cattle randomly selected from the general population if vaccinated with highly attenuated T strain. A hypothesis is offered to explain these findings.
引用
收藏
页码:296 / 300
页数:5
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