FILE PHOTO: Nurse Christina McCavana prepares the vials of the Pfizer coronavirus disease (COVID-19) vaccine for use at a pop-up vaccination clinic in the Central Fire Station in Belfast, Northern Ireland, December 4, 2021. REUTERS/Clodagh Kilcoyne
FILE PHOTO: Nurse Christina McCavana prepares the vials of the Pfizer coronavirus disease (COVID-19) vaccine for use at a pop-up vaccination clinic in the Central Fire Station in Belfast, Northern Ireland, December 4, 2021. REUTERS/Clodagh Kilcoyne