WHITEHOUSE STATION, N.J.--(BUSINESS WIRE)--Jan. 6, 2006--Merck & Co., Inc. will hold a fourth-quarter 2005 sales and earnings conference call with institutional investors and analysts beginning at 9 a.m. ET on Tuesday, Jan. 31. During this call, Graeme Bell, senior director, Investor Relations, joined by Richard T. Clark, chief executive officer and president, and Judy C. Lewent, executive vice president and chief financial officer, will provide an overview of Merck’s financial performance for the quarter.