FILE - In this Dec. 15, 2020, file photo, a sign for Moderna, Inc. hangs on its headquarters in Cambridge, Mass. Moderna's experimental COVID-19 vaccine that combines its original shot with protection against the omicron variant appears to work, the company announced Wednesday, June 8, 2022. COVID-19 vaccine makers are studying updated boosters that might be offered in the fall to better protect people against future coronavirus surges.(AP Photo/Elise Amendola, File)