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I wouldn’t dismiss it out of hand. Check out An oral vaccine for SARS-CoV-2 RBD mRNA-bovine milk-derived exosomes induces a neutralizing antibody response in vivo [1].

[1]: https://www.biorxiv.org/content/10.1101/2022.12.19.517879v1

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That's a completely different architecture than current lipid nanoparticle mRNA vaccines. It would be obvious to anyone with even a modicum of knowledge that the linked paper is not relevant.

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