The Latest: Surgeon General: Virus booster shots ‘possible’

              FILE - In this Friday, March 12, 2021 file photo, a nurse prepare one of the country's first coronavirus vaccinations, using the AstraZeneca vaccine manufactured by the Serum Institute of India and provided through the global COVAX initiative, at Yaba Mainland hospital in Lagos, Nigeria. Although the AstraZeneca vaccine produced in Europe has been authorized by the continent’s drug regulatory agency, the same shot manufactured in India by the world’s biggest vaccine maker has not been given the green light. The EU regulator says the drugmaker hasn't completed the necessary paperwork on the Indian manufacturing site, including detail on its production practices and quality control standards. (AP Photo/Sunday Alamba, file)