A nursing home worker, left, receives the first dose of the AstraZeneca COVID-19 vaccine at a health care center in Seoul Friday, Feb. 26, 2021. South Korea on Friday administered its first available shots of coronavirus vaccines to people at long-term care facilities, launching a mass immunization campaign that health authorities hope will restore some level of normalcy by the end of the year. (Jung Yeon-je /Pool Photo via AP)