Spickett A M, Bezuidenhout J D, Jacobsz C J
Onderstepoort J Vet Res. 1981 Mar;48(1):13-4.
An attempt was made to attenuate Cowdria ruminantium by irradiation of the nymphal stage of its tick host, Amblyomma hebraeum. The irradiated nymphs were homogenized and serial dilutions of the resultant suspension were injected intravenously into heartwater-susceptible sheep. No attenuation could be demonstrated but the results indicate that progressively more micro-organisms will be destroyed the higher the irradiation dosage applied, and that dosages between 20 and 30 kilorad apparently prove fatal to all the pathogenic organisms.
人们尝试通过辐照其蜱宿主希伯来花蜱的若虫阶段来减弱反刍兽考德里氏体。将辐照后的若虫匀浆，所得悬浮液进行系列稀释后静脉注射到易患心水病的绵羊体内。未证明有减毒效果，但结果表明，辐照剂量越高，被破坏的微生物就越多，并且20至30千拉德之间的剂量显然对所有致病生物都是致命的。
