Immunoprophylaxis of Salmonella infection caused by S. dublin in calves

: Studied is the active immunoprophylaxis of calves on farms with a Salmonella dublin infection, using a live vaccine produced with a S. dublin attenuated strain. The disease was fully suppressed among calves through vaccination after the tenth day following birth. However, the source of infection was not done away with, and it was most likely to be found in adult cattle. This was reasonable to believe as there was a second outbreak of the disease in a group of unvaccinated, newborn calves. The regular vaccination is suggested of all newborn calves up to the time when the adult population would occasionally be replaced.