Sanofi drops as FDA names agency critic as top vaccine official

Shares in Sanofi SASY.PA drop around 3% as U.S. FDA appointed on Tuesday the agency critic Vinay Prasad as top vaccine official

Prasad was appointed the director of the Center for Biologics Evaluation and Research (CBER), overseeing regulation of drugs, including vaccines

Bernstein's analyst Florent Cespedes says Prasad's appointment put pharmaceutical stocks under pressure with vaccine companies being more impacted

Shares in Sanofi, which is one of the world's largest vaccine makers by sales, trade at the bottom of France's blue-chip CAC 40 Index .FCHI

They will see their worst day in almost a month, if losses hold