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.
Smith
T
T
Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.
Little
R B
RB