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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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Category:
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mise à jour avec succès:
26 nov. 2017
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Sophie
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polio
By
Sophie
26 nov. 2017
1
0
480
Les événements
The Poliomyelitis Vaccination Act was passed by Congress and signed by President Eisenhower. This act provided 9.8 million doses.
Sabin vaccine developed and released to other researchers of polio.
200 million people have received the Salk vaccine.
Polio decreased dramatically by this time.
Sabin vaccine was proven safe and was released to all people.
The Salk vaccine was proven safe.
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