Why oral vaccination is effective against polio?

Polio is caused by a virus that is ingested via the mouth and then infects the gut. It makes sense to use a vaccine that is administered the same way We used a weakened strain of the polio virus that was administered orally for years. It has a lot of advantages to the inject-able vaccine but when the disease became so rare in the western world that most of the cases may have been related to the vaccine itself it made sense to switch to the injection.

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