This photograph shows an exhibit about syphilis titled, "The Shadow on the Land" that appeared at the 1939 World's Fair. It features a large microscope, photographs of family and children, and a map of the United States. Fair visitors are shown looking at the exhibit.
Source
American Social Health Association Records (1905-2005), University of Minnesota, Social Welfare History Archives, Box 186, Folder 1.
This photograph shows an exhibit on public health at the 1939 New York World's Fair. It features displays on infantile paralysis (polio), tuberculosis, rickets, and other issues. There is also an iron lung displayed.