Clostridium tetani Disease Overview The bacterium found to cause tetanus in cows. Merck Animal Health Solutions For Clostridium tetani BOVILIS® CAVALRY® 9 Shown to be effective for the vaccination of healthy cattle 3 months of age or older against disease caused by Clostridium chauvoei, Cl. septicum, Cl. novyi Type B, Cl. haemolyticum, Cl. sordellii, Cl. tetani and Cl. perfringens Types C and D. Learn More Clinical Signs Localized stiffness Intensified reflexes Easily excited Spasms Sweating