U.S. Health Secretary Robert F. Kennedy Jr.'s newly revamped vaccine advisory panel voted on Thursday to recommend Americans receive seasonal influenza shots that are free from the mercury-based preservative thimerosal despite decades of studies showing no related safety issues.

Ahead of the first meeting of newly appointed vaccine advisers to the US Centers for Disease Control and Prevention, lawmakers are sharing fresh concerns about the panel’s membership and last-minute actions that could see Covid-19 and influenza vaccines thrown into question.