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oct 1, 1955 - Polio Vaccine

Description:

In 1955, the development of the polio vaccine by Jonas Salk led to widespread immunization against the disease ("How Mandatory Vaccination Fueled the Anti-Vaxxer Movement")

Added to timeline:

Byo
9 Dec 2019
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Date:

oct 1, 1955
Now
~ 68 years ago