infectious disease in cattle, water buffalo, and bison, usually caused by Brucella abortus, less frequently by B. melitensis, and occasionally by B. suis, characterised by one or more of the following signs: abortion, retained placenta, orchitis, epididymitis and, rarely, arthritis, with excretion of the organisms in uterine discharges and in milk

venereal disease in cattle caused by Tritrichomonas foetus, a flagellate protozoan parasite and which is asymptomatic in bulls while in cows it is characterised by infertility, abortion, embryonic and early fetal death, fetal maceration, pyometra and vaginal discharge