From left: A New Delhi woman waits in an observation room after getting the Covishield vaccine (the name used for the AstraZeneca vaccine in India) on May 26. U.K. Prime Minister Boris Johnson leaves a vaccination center after his first AstraZeneca dose on March 19. On March 9, Nairobi, Kenya, began vaccinating groups, including health care workers and older people, with the AstraZeneca vaccine. (From left: Prakash Singh, Aaron Chown, Robert Bonet/Getty Images)
