For use in healthy cattle and sheep as an aid in preventing blackleg caused by clostridium chauvoei, malignant edema caused by Cl septicum, black disease caused by Cl novyi, gas-gangrene caused by Cl sordellii and enterotoxemia and enteritis caused by Cl perfringens types B, C and D. Although Cl perfringens type B is not a significant problem in North America, immunity is provided by the beta toxoid of type C and the epsilon toxoid of type D. Ultrabac 7 consists of killed, standardized cultures of Cl chauvoei, Cl septicum, Cl novyi, Cl sordellii and Cl perfringens types C and D, with an adjuvant.