The method of control depends on the age of the lambs, the frequency with which the disease appears on a particular property, and the method of husbandry. If the disease is seen consistently in young lambs, ewe immunization probably is the most satisfactory method of control. Breeding ewes should be given two injections of type D toxoid in their first year, a booster injection 4–6 wk before lambing, and each year thereafter.