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AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
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polio
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è stato aggiornato:
26 nov 2017
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Sophie
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eee
By
Sophie
26 nov 2017
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462
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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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