RISK-FACTORS FOR SALMONELLA-DUBLIN INFECT IONS ON DAIRY FARMS

A case-control investigation of the risk factors for Salmonella dublin infections on 126 dairy farms identified the following variables as b eing significantly associated with infection: standardized farm size a nd presence of water courses. Contrary to expectations, contact with c attle from other farms when the animals were turned out to grass was n egatively associated with S. dublin infection. The purchase of cattle from other farms was a risk factor. There were more infections when fe ed consisted of grass alone than when grass was supplemented with maiz e or grass silage. S. dublin infections were strongly correlated with liver fluke infections.