Salk’s polio vaccine has two main drawbacks; it is not completely effective against one of the three strains of polio and it gives immunity only for a limited time which means the child has to be re-vaccinated regularly.
The oral polio vaccine was developed by Albert Sabin at the University of Cincinnati. It uses a small amount of live virus unlike the Salk vaccine which uses samples of the virus which has been killed by formation.
The Sabin vaccine is given orally. It gives immunity against all three strains of polio. It does not have to be taken as often as the Salk vaccine – just three separate doses with intervals of one month each between each dose and then a booster some years later.
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