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Dr. McAteer vaccinating a child with hypospray jet injector. The jet injector uses a high-pressure narrow jet of the injection liquid instead of a hypodermic needle to penetrate the skin.
Rhode Island polio epidemic
Centers for Disease Control and Prevention
“CHILD VACCINATION,” The Global Health Chronicles, accessed January 20, 2019, https://globalhealthchronicles.org/items/show/6379.