The U.S. Food and Drug Administration 's top vaccine regulator is returning to his post less than two weeks after the White House had him ousted . Dr. Vinay Prasad will again head the FDA's Center for Biologics Evaluation and Research, which oversees vaccines and complex treatments for serious diseases, the U.S. Department of Health and Human Services confirmed. HHS spokesperson Andrew Nixon said Prasad is resuming his role "at the FDA's request," according to The Washington Post. "Neither the