Establishing shot of a busy street in front of a building. Woman in a lab producing polio vaccine using chicken eggs. Cut to a shot of a truck spraying for insects in a suburban neighborhood. Shots of scientists working in a lab with microscopes and glassware. Dr. John Enders at Harvard University works at his desk and speaks to a female scientist. Enders and others work in a laboratory. Shot of children running and playing in front of a large building. Inside, doctors examine a boy’s atrophied legs. Another boy receives hydraulic therapy in a polio ward.