Typical example of not understood what you think you are talking about. Oral polio is in fact a vaccine. However vaccines disturbed orally or nasally like influenza almost be live in order to generate a response. Hence the reason they are referred to as live attenuated virus. Injectable polio is a protein instead of the whole virus. Because if is injected there is zero risk of disease as a specific protein is being targeted and elicits the immune response.
MRNA as others point out will not tolerate the digestive track. It will be cleaved and taken apart in the stomach acid. What’s my proof. As one common sense poster stated above demonstrating a basic understanding of biology — meat is tissue!! Made of cells!! With DNA and RNA in it. The RNA in the near is not transcribed in our cells as it does not become absorbed.
Embarrassing.
Possible counterexample see post #55.