The Bacillus abortus of Bang is the cause of abortion in cows, but the specific germ that produces abortion in other species of animals has not been proven.
"Common Diseases of Farm Animals"
R. A. Craig, D. V. M.
Bacillus abortus of Bang, the cause of contagious abortion in cattle.
"Contagious Abortion of Cows"
Ward J. MacNeal