** 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
(Reporting by Michal Aleksandrowicz)
((michal.aleksandrowicz@tr.com))
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