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jan 1, 1952 - A Vaccine For Polio Was Developed

Description:

Who: Jonas Salk

What: He Develop a vaccine for polio and help many kids get vaccinated

Why:I chose this because many people woulkd have died to this dangurerus virus

Added to timeline:

Heath Science

ByNathan Vong
10 Feb 2020
0
0
296

Date:

jan 1, 1952
Now
~ 74 years ago
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