Munday B L, Corbould A
Aust J Exp Biol Med Sci. 1979 Apr;57(2):141-5. doi: 10.1038/icb.1979.14.
During a four and a half year period a group of cattle was grazed continuously with a group of sheep and observed for Toxoplasma antibodies. Initially, there were 25 cattle and 31 sheep, but these were reduced to 19 and 18, respectively, by the end of the observation. Only transient antibody responses were noted in 2 cattle, whereas persistent titres developed in 12 sheep. Interpreted in the light of available information, these results were taken to indicate that cattle do not readily acquire persistent T. gondii infections.
在四年半的时间里，一组牛与一组羊持续混牧，并观察弓形虫抗体情况。最初有25头牛和31只羊，但到观察结束时，分别减少到了19头和18只。仅在2头牛中发现了短暂的抗体反应，而12只羊产生了持续的抗体效价。根据现有信息进行解读，这些结果表明牛不容易获得持续性弓形虫感染。
