Moderna's shares fell 2.3% on Friday on concerns about whether a new CDC advisory panel would back the use of the company's respiratory syncytial virus vaccine in a broader age group. The mRNA-based RSV shot,

The Food and Drug Administration expanded the approval of Moderna’s RSV vaccine on Thursday, extending the license to include adults aged 18 to 59 who are at high risk of severe illness if they contract respiratory syncytial virus. Previously the vaccine, sold under the name mResvia, was only licensed for use in adults aged 60 and older.