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https://image.cnbcfm.com/api/v1/image/108025079-17244411782024-08-23t191753z_1265172004_rc2ul9aquvj7_rtrmadp_0_usa-election-kennedy.jpeg?v=1724441329&w=1920&h=1080Shares of Moderna, Novavax, Pfizer, BioNTech and GSK closed lower on Thursday.