The Veterinary Feed Directive affects antimicrobials administered in which forms?

• A. In feed only
• B. In feed or drinking water
• C. Injectable or bolus forms only
• D. Topical sprays and dusts

Answer: (B)

The key idea is that the Veterinary Feed Directive governs how medically important antimicrobials are used when they are delivered through feed or drinking water. A VFD order from a veterinarian is required to use these drugs in those two delivery methods, specifying the drug, target animals, and conditions (including withdrawal times) to ensure appropriate use and accountability. Antimicrobials given by other routes—such as by injection, bolus, topical sprays, or dusts—are not covered by the VFD and follow different prescribing or administration rules. Therefore, antimicrobials affected by the VFD are those administered in feed or in drinking water.