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1952
Polio becomes a feared disease worldwide. Polio was a very contagious disease that can cause death. -
Salk Vaccine Trials
Salk vaccine trials began with gruops of children. On the basis of these trials Sabi's vaccine was found with a longer-lasting immunity. -
Vaccine Approved
Salk vaccine was successful. The vaccine was declared 90% effective, the effectiveness of the
vaccine caused a mass vaccination campaign.
the polio vaccine reach the U.S
https://texashistory.unt.edu/ark:/67531/metapth1333576/m1/2/?q=polio%20vaccine -
Sabin Oral Vaccine
Sabin invented a oral vaccine. The oral Vaccine cost lest than the Salk vaccine and it had long term effecacy. -
Oral Vaccine
The world was using Sabin's oral vaccine because of its lower cost and long term effecacy.