In 1947, smallpox vaccination lines curved around a building and along New York streets. A photograph reproduced in a city health-department history booklet and credited to the Municipal Archives shows several large outdoor queues from above. New York City records that roughly 6.3 million people were vaccinated in a single month during the outbreak. Other municipal material describes the rush to diagnose cases, secure vaccine and persuade the public to be inoculated. The photograph does not establish each person’s waiting time or the precise clinic location. What it does preserve, alongside the campaign total, is the physical form of mass public health: millions of individual turns, organized into lines occupying an urban block.