RISK-FACTORS FOR SALMONELLA-DUBLIN INFECTION ON DAIRY FARMS

In a case-control study of risk factors for Salmonella dublin on 126 d airy farms the following variables were significantly associated with infection. Standardized herd size and water surface area showed a posi tive association. Contact with cows from other herds during exchange w as, unexpectedly, preventive for S. dublin infection. Purchase of cows from other herds was a risk factor. More infections occurred when the feed consisted of grass only compared to grass supplemented with maiz e or silage. S, dublin infection was highly associated with a liver fl uke infection.