The U.S. Food and Drug Administration's top vaccine official, Vinay Prasad, has left the agency after just three months as Director of the Center for Biologics Evaluation and Research, a government spokesperson said.

Dr. Vinay Prasad, the controversial critic of the US Food and Drug Administration who took a top role at the regulatory agency in May, has resigned less than three months into the job.

Vinay Prasad, a top official at the Food and Drug Administration, has suddenly departed after a series of controversial decisions about a treatment for boys with Duchenne muscular dystrophy.