Dr. Jonas Salk's polio vaccine is judged safe and effective in 1955

On April 12, 1955, in Ann Arbor, Michigan, doctors and scientists gathered to hear the results of the Salk polio vaccine tests. Dr. Thomas E. Francis announced the vaccine was safe, effective, and potent. The world expressed gratitude to Dr. Jonas Salk, with President Eisenhower officially acknowledging his contribution. The success was widely reported, coinciding with the tenth anniversary of Franklin D. Roosevelt's death, a famous polio patient.

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