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polio
Category:
Autre
mise à jour avec succès:
26 nov. 2017
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436
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Sophie
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eee
By
Sophie
26 nov. 2017
0
0
458
Les événements
Polio was the most feared disease of this time.
Jonas Salk announced that he was developing a trial vaccine for polio.
The Salk vaccine was tested on 1.8 million schoolchildren.
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