The Science of Healthier Animals. MERCK Animal Health 375 S. Lake Street Worthington, MN 56187 P.O. Box 775 www.merck-animal-health-usa.com 507.372.7726 001818764r1 The Science of Healthier Animals. MERCK Animal Health 375 S. Lake Street Worthington, MN 56187 P.O. Box 775 www.merck-animal-health-usa.com 507.372.7726 001818764r1