New York, December 08, 2014 -- Moody's Investors Service affirmed the ratings of Merck & Co., Inc. ("Merck"). The affirmed ratings include the A1 senior unsecured notes guaranteed by Merck Sharp & Dohme Corp., the A2 senior unsecured notes that are not guaranteed, the A1 senior unsecured notes issued by Merck Sharp & Dohme Corp., and the Prime-1 commercial paper rating. The rating outlook is stable.

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