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05-10-2021
Medicine

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how long was the polio vaccine tested before it was released?

Respuesta :

5294471 5294471

12-10-2021

Answer:

The results were tracked by volunteers using pencils and paper. And it lasted just one year, with officials hopeful at the outset that they would be able to begin giving the vaccine to children within weeks of the final results.

Explanation:

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