For use in healthy cattle and calves three months of age or older 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, enterotoxemia and enteritis caused by Cl perfringens Types B, C and D and disease caused by Histophilus somni (Haemophilus somnus). 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/Somubac consists of killed, standardized cultures of Cl chauvoei, Cl septicum, Cl novyi, Cl sordellii, Cl perfringens types C and D and H somni, with an adjuvant.