Shake well before using. Administer 2 mL subcutaneously. In accordance with Beef Quality Assurance guidelines, this product should be administered subcutaneously (under the skin) in the neck. For footrot revaccinate in 3 weeks. For liver abscesses revaccinate in 60 days. Historically, revaccination was recommended annually, anytime endemic conditions exist, or when exposure was imminent. The need for this booster has not been established. For more information on revaccination frequency, in general or in the face of disease exposure, consult your veterinarian.