The Food and Drug Administration authorized Novavax Inc.'s /zigman2/quotes/202614340/composite NVAX +0.13% COVID-19 vaccine for use in U.S. teenagers on Friday. Novavax's recombinant protein-based vaccine uses different technology than the mRNA shots developed by Moderna Inc. /zigman2/quotes/205619834/composite MRNA -1.51% and BioNTech SE /zigman2/quotes/214419716/composite BNTX +0.26% , and received an emergency-use authorization by the FDA for adults in July. The vaccine still requires a policy recommendation for use by the Centers for Disease Control, which followed the FDA by about a week when authorizing the Novavax shot for adults. Novavax shares ticked 0.6% higher in late trading Friday, after the announcement; the stock has declined nearly 75% so far this year, as the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.15% has dropped 11.8%.








