Merck & Co., Inc. is a health care company that offers health solutions through its prescription medicines, vaccines, biologic therapies, animal health, and consumer care products, which it markets directly and through its joint ventures. The Company�s operations are comprised of four operating segments, which are the Pharmaceutical, Animal Health, Consumer Care and Alliances segments. The Pharmaceutical segment includes human health pharmaceutical and vaccine products marketed directly by the Company or through joint ventures. It also has animal health operations that discover, develop, manufacture and market animal health products, including vaccines, which the Company sells to veterinarians, distributors and animal producers. Additionally, it has consumer care operations that develop, manufacture and market over-the-counter, foot care and sun care products, which are sold through wholesale and retail drug, food chain and mass merchandiser outlets, among others.