OUTBREAKS OF SALMONELLA-DUBLIN INFECTION AMONG CALVES ON A DAIRY FARMAPPLYING SALMONELLA BACTERINS IN ZAMBIA

In Zambia, a dairy farm keeping about 600 cows and self-contained calv es had applied S. Dublin and S. Typhimurium bacterins to pregnant cows and calves in combination with all-in all-out pen system for rearing calves. Only relatively small scale outbreaks of S. Dublin infection o ccurred repeatedly in these years from 1989 to 1991 among fattening ca lves on the farm. The results obtained from the epizootiological study suggest that the preventive measures including the vaccination with S almonella bacterins gave insufficient protection against S. Dublin inf ection to the calves, but they might have prevented large scale outbre ak of the disease. This is the first report of the epizootiological st udy on outbreak of bovine S. Dublin infection on farm in Zambia.