Dr. Thomas Francis and Dr. Jonas Salk


Dr. Thomas Francis and Dr. Jonas Salk

Dr. Thomas Francis from the University of Michigan and Dr. Jonas Salk, vaccine developer, announce the success of polio vaccine in field trials in April 1955 in Ann Arbor, Michigan.



Copyright: Creative Commons (Attribution, Non-Commercial, Share-alike)
Rights Held by: Ypsilanti Historical Society
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