Merck & Co., Inc. engages in the provision of health solutions through its prescription medicines, vaccines, biologic therapies, animal health, and consumer care products. It operates through the following segments: Pharmaceutical, Animal Health, Alliances and Healthcare Services. The Pharmaceutical segment includes human health pharmaceutical and vaccine products marketed either directly by the company or through joint ventures. Its human health pharmaceutical products consist of therapeutic and preventive agents, generally sold by prescription, for the treatment of human disorders. The Animal Health segment discovers, develops, manufactures and markets animal health products, including vaccines, which it sells to veterinarians, distributors and animal producers. The Alliances segment includes revenue from the company relationship with AstraZeneca LP. The Healthcare Services segment provides services and solutions that focus on engagement, health analytics and clinical services to imp