Merck & Co. Inc (MSD) is a biopharmaceutical company focused on the discovery, development, manufacturing and marketing of prescription medicines, biologic therapies, vaccines and animal health products. It offers prescription products for therapy areas related to cardiovascular, cancer, immune disorders, infectious, respiratory and women's diseases, and diabetes. The company provides animal health products such as vaccines, poultry products, livestock products and aquaculture products. MSD sells animal health products to veterinarians, distributors and animal producers.