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Merck & Co., Inc. is a global healthcare company with operations in more than 140 countries. It offers therapeutic and preventive agents to treat cardiovascular, type 2 diabetes, asthma, nasal allergy symptoms, allergic rhinitis, chronic hepatitis C virus and other diseases. The company has collaboration agreements with Adaptimmune Therapeutics plc and Agenus; and a research agreement with Proteros Biostructures. Founded in 1891, it is headquartered in Kenilworth, New Jersey.