By using Bar-Vac, producers can help eliminate the chance of tissue damage, common with intramuscular injections, and rest easy knowing that they're controlling clostridial disease with this proven formulation. This vaccine provides 7-way blackleg plus somnus protection for cattle. Prevents Clostridium chauvoei, septicum, novyi, sordellii, perfringens Types C & D plus Haemophilus somnus. Give cattle 5 ml Give cattle 5 ml subcutaneously . Repeat in a 3 to 4 week cycle and once annually.