FILE PHOTO: A sign marks the offices of Moderna in Cambridge, Massachusetts, U.S., July 22, 2025. REUTERS/Brian Snyder/File Photo By Christy Santhosh and Mariam Sunny June 18 (Reuters) - The U.S. Food and Drug Administration's advisory panel is set to vote on whether the benefits of Moderna's flu vaccine outweigh its risks in older adults, after regulators reversed course on rejecting the drugmaker's initial application for the shot.