A flu vaccine is prepared in Mountain Lakes, N.J., Sept. 16, 2025. (Laila Stevens/The New York Times) By CHRISTINA JEWETT and REBECCA ROBBINS The Food and Drug Administration reversed its decision on Moderna’s flu vaccine and has agreed to review it for possible approval. On Feb. 10, Moderna announced that the agency had rejected its application for review of a new flu vaccine. The FDA said the company’s research design had been flawed. But in subsequent discussions, the agency had relented...