FURTHER DATA ON THE EFFECT OF VACCINATION AGAINST BOVINE INFECTIOUS ABORTION.
The partial protection afforded by four injections of a heated culture of Bacillus abortus of normal virulence during the first pregnancy is in part lost in the second. The superiority of a single injection of a living culture of relatively low virulence is evident in both pregnancies. In the experiment described, the protection was complete.
Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.
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