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Summary  Two dairy herds, situated on a sewage farm, were monitored for the presence of salmonellas following outbreaks of  Salmonella dublin  infection. In addition an  S. dublin  control scheme, which involved examination of adult animals and calf vaccination, was instigated.  During the period 1975–84, 12 salmonella serotypes and 10 phage types of  S. typhimurium  were isolated from the cattle and their environment although their presence was seldom associated with disease. Two adult  S. dublin  excreters were detected but it was concluded that none of the tests employed to examine the adult animals was sensitive enough. The prevalence of disease in the calves was low and although vaccination may have been beneficial it did not eradicate  S. dublin  infection. Thus  S. dublin  persisted in adults and calves during the 8-year period but its presence was seldom associated with disease. The results are discussed with regards the disease risk to animals from the agricultural use of sewage sludge and the public health aspects.

Salmonellosis in two dairy herds associated with a sewage farm and water reclamation plant