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In Zambia, a dairy farm keeping about 600 cows and self-contained calves 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 occurred repeatedly in these years from 1989 to 1991 among fattening calves on the farm. The results obtained from the epizootiological study suggest that the preventive measures including the vaccination with Salmonella bacterins gave insufficient protection against S. Dublin infection to the calves, but they might have prevented large scale outbreak of the disease. This is the first report of the epizootiological study on outbreak of bovine S. Dublin infection on farm in Zambia.

Outbreaks of Salmonella Dublin Infection among Calves on a Dairy Farm Applying Salmonella Bacterins in Zambia.