Polio Vaccine

Pittsburgh, PA

1955-polio-vaccine.jpgJonas Salk develops the first vaccine for polio. Polio was once one of the most feared diseases because the virus had no identified causes and it presented the potential for permanent disability or death if contracted. Before polio vaccines were available, polio outbreaks caused more than 15,000 cases of paralysis each year in the U.S alone.

World Population : 170,060,000

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