HomeCOVID vaccine makers shift focus to boostersFILE PHOTO: COVID-19 vaccination at the vaccination reference center in

FILE PHOTO: COVID-19 vaccination at the vaccination reference center in

FILE PHOTO: A healthcare worker fills up a syringe with a dose of Moderna's COVID-19 vaccine for a booster shot at the vaccination reference center at the Epidemiology, Biostatistics and Prevention Institute (EBPI) in Zurich, Switzerland November 17, 2021. REUTERS/Arnd Wiegmann