Pro-Bac 4 is a cattle vaccine designed for the vaccination of healthy cattle three months of age or older. This livestock health product targets Haemophilus somnus, Mannheimia haemolytica Type A-1 and A-6, and Pasteurella multocida Type A-3. The convenient 100 mL vial supports efficient herd protocols with a 2 mL per dose subcutaneous administration. An effective option for producers seeking cattle health solutions backed by targeted bacterin protection. Duration of immunity has not been determined.