Actually, it doesn't matter even if it get destroyed, because any way the immune system single recognizes portions of any antigen (epitopes), so even if the polio vaccine is broken down into smaller peptides, it would be taken up by the B lymphocytes within the lymphoid tissue (mainly, Peyer's patches) in the intestinal mucosa (the innermost veil of intestines) and recognized. Then, 3 types of antibodies would be produced contained by response immunogloblin A (IgA) and IgG and IgM. But, it is IgA, which is of greatest importance.
Actually because a polio vaccine is containing a pale strains of live polio virus in it. A polio virus is a non-enveloped virus. Unlike an enveloped virus approaching influenza or HIV, a non-enveloped one cannot be destroyed by enyzimes in our stomach's digestive system.
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