Key points are not available for this paper at this time.
W. L. Jellison, H. H. Welsh, B. E. Elson, R. J. Huebner, Q Fever Studies in Southern California: XI. Recovery of Coxiella burnetii from Milk of Sheep, Public Health Reports (1896-1970), Vol. 65, No. 12 (Mar. 24, 1950), pp. 395-399
Jellison et al. (1950) studied this question.