For use in healthy cattle as an aid in preventing disease caused by Clostridium chauvoei (Blackleg), C. septicum (Malignant edema), C. novyi (Black disease), C. sordellii, C. perfringens Types C and D (Enterotoxemia), and Haemophilus somnus.

2 mL administered subcutaneously followed by another 2 mL injection three to four weeks later. Annual revaccination is recommended.

https://www.merck-animal-health-usa.com/hub/channel-content/vision-7-somnus/