Jonas Salk joined the University of Pittsburgh School of Medicine in 1947 as director of the Virus Research Laboratory. There he led a research team that developed the first successful inactivated (killed) polio vaccine. Supported by funding from the National Foundation for Infantile Paralysis (March of Dimes), Salk conducted laboratory studies, animal experiments, and clinical trials that culminated in the vaccineās successful nationwide field trial and its introduction for broad use in 1955.
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