1 jan 1955 ano - polio vaccine

Descrição:

the polio vaccine changed thousands of lives, not only saving them, but helping them survive too. polio was a major problem in the 1950s, as it killed 3,145 people per year! that may not seem like much now, but it was a lot back then.



.https://www.historylearningsite.co.uk/inventions-and-discoveries-of-the-twentieth-century/inventions-1900-to-1990/

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