A medical worker uses a loud speaker to give advice to people as they wait for their coronavirus test at a makeshift testing site in Seoul, South Korea, Wednesday, Feb. 23, 2022. South Korean health officials on Wednesday approved Pfizer’s coronavirus vaccine for the country’s unvaccinated younger children, expanding its immunization program in the face of a massive omicron outbreak that is beginning to drive up hospitalizations and deaths. (AP Photo/Ahn Young-joon)
