The controversial head of the U.S. Food and Drug Administration's vaccines and biologics unit, Dr. Vinay Prasad, will leave the agency at the end of April. FDA commissioner Dr. Marty Makary posted about the departure on social media platform X, saying Prasad would return to the University of California San Francisco School of Medicine, where he is a professor, and that he had accomplished much during his one-year sabbatical. The news was first reported by The Wall Street Journal. Makary said a successor will be named before Prasad's departure. Prasad, an oncologist, was an outspoken critic of U.S. drug and vaccine policies, particularly around COVID-19 mandates, before joining the agency.