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What Is the Yellow Fever Vaccine?
The polio vaccine was developed in the 50s after the yellow fever. The only one that has had an issue is the polio replication competent vaccine, you take it orally. It's wonderful because you don't have to inject it. However, you do shed virus out and that virus is no longer a vaccine. So now we have to go back to the inactivated vaccine, which is tough because it's injected.