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Little girl looking at plaster where she has had an injection

Little girl looking at plaster where she has had an injection

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As eight-year-old girl receives a polio vaccine, she watches a closed circuit television broadcast (showing Dr Jonas Salk as he inoculates a boy) of a training telecast for physicians and scientists, New York, New York, April 12, 1955. (Photo by PhotoQuest/Getty Images)

As eight-year-old girl receives a polio vaccine, she watches a closed circuit television broadcast (showing Dr Jonas Salk as he inoculates a boy) of a training telecast for physicians and scientists, New York, New York, April 12, 1955. (Photo by PhotoQuest/Getty Images)

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Girl getting polio drops

Girl getting polio drops

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Close up of nurse preparing a syringe for an injection

Close up of nurse preparing a syringe for an injection