Clostrivax O is an adjuvanted multi-component vaccine for the active immunisation of sheep against diseases caused by Clostridium perfringens type A (enterotoxaemia), C. perfringenstype D (pulpy kidney), C. tetani (tetanus),C. novyi type A (swollen head), C. novyitype B (black disease), C. chauvoei(black quarter), C. septicum (malignantoedema), Bibersteinia trehalosi(pasteurellosis) and Mannheimiahaemolytica type A1 (pasteurellosis).