Boy receives polio vaccine photograph

Dated February 22, 1957, this photograph shows a woman administering a polio vaccine to a young boy. A large crowd of children and their families stand behind them waiting in line. Polio, a virus that causes paralysis, especially in young children, was a major public health concern in the United States and globally from the early 1900s through the 1950s. In 1952, Jonas Salk at University of Pittsburgh developed the first effective polio vaccine, which was given to hundreds of thousands of children across the country