Overview BOVILIS® VISION® 7 SOMNUS with SPUR® has been shown to be effective for the vaccination of healthy cattle against disease caused by Clostridium chauvoei (Blackleg), Cl. septicum (Malignant edema), Cl. novyi (Black disease), Cl. sordellii, Cl. perfringens Types C and D (Enterotoxemia), and Histophilus somni.