10 Lyon, L. Jack Cain, Steve Cheville, Norman F. Davis, Don Nicoletti, Paul Stewart, Mark 1995 Greater Yellowstone Interagency Brucellosis Committee 4p. August 1995 73 brucella, Brucella abortus, brucellosis, wildlife health, transmission, bison, cattle, bull, bacteria Bison in Yellowstone National Park and Grand Teton National Park are known to harbor the Brucella abortus organism. Although the testing program for this disease has been somewhat sporadic, a significant number of reactors has been regularly reported since the initial discovery in 1917. These seropositive animals are not considered a problem in the breeding biology of the bison herd. However, they are considered a possible source of brucellosis for cattle when they cross the Park boundaries.Emigrating bison require consideration if there is any potential for transmission of brucellosis to domestic cattle. The normal transmission mode involves direct contact with tissues or discharges from female animals that have aborted. The danger of transmission by bulls is clearly less than the danger of transmission by bison cows, but the level of that danger has not been specifically determined. Found in Bison LibraryNatureBib ID: 652303