WHITEHOUSE STATION, N.J.--(BUSINESS WIRE)--Merck & Co., Inc. said today it has extended to June 30, 2008, the enrollment deadline for U.S. eligible claimants with cases filed or tolled by Nov. 9, 2007 wishing to be part of the program to resolve state and federal myocardial infarction (MI) and ischemic stroke (IS) claims filed against the Company in the United States. The Company formally extended the Walk Away Enrollment Deadline Date by which the Company could elect to terminate the resolution program to June 30; this action automatically extended the enrollment deadline to June 30.