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1 oct 1955 año - Polio Vaccine

Descripción:

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")

Añadido al timeline:

History of Anti-Vaxxers

Byo
9 dic 2019
0
0
315

fecha:

1 oct 1955 año
Ahora mismo
~ 70 years ago
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