Maxi/Guard from Elanco is a cattle vaccine formulated as a suspension containing formalin-inactivated isolates of Moraxella bovis (bacterin). Designed for subcutaneous administration, this livestock health product supports herd vaccination protocols with a convenient 2 mL per dose format. Each 20 mL vial offers multiple doses for straightforward on-farm use. No prescription is required in most of Canada; a prescription is required in Quebec.