re: Moderna Phase 3 Vaccine clinical trial concludes October,2022

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The polio vaccine we gave out for years actually resulted in polio in many cases.

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Which has absolutely nothing to do with an mRNA platform.

Until now, vaccines involved exposure to some form of an existing virus. It was either a far less potent variant, or an inactivate or attenuated form.

The initial polio vaccine was an inactivated virus. That is to say, a culture of actual virus is exposed to mechanisms designed to render it unable to reproduce. Those mechanisms by some production firms in the 1950's were suboptimal. Meaning some recipients received injections of potent virus. Those individuals got polio. Six decades later, the risk profile is much improved.

None of which has a thing to do with the Moderna vaccine. MRNA vaccines never bring the recipient into contact with actual virus, either inactivated or attenuated. It is literally impossible to catch CV19 from the Moderna vaccine. That is a major reason it can come to market in an accelerated timeframe.