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It sounds as if you are talking about something that everyone should know. What do you mean? The mention of "emergency use authorization" makes me think you are mistakenly talking about the SARS-Cov2 vaccines - mistakenly because they indeed went through human trials that established safety and efficacy.

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The establishment of safety implies long term testing, something that was never done on humans. The 2017 trials of the rabies vaccine was a phase I trial and you cannot gather long term testing data in 3 years. That, along with some influenza testing later on, was the extent of the testing of mRNA vaccine tech. I'm just saying that before we outright dismiss a potentially viable solution because it hasn't been testing on humans let's look at the larger picture.

Was there ever any issue with any type of vaccine that did not occur within weeks of administration? I remember reading an article that said that serious adverse effects of vaccines either occur soon after giving them or not at all.

That does not mean that there could not be any or that we should not look but that from what we seem to know about how vaccines work, it would be very unlikely to find anything like that.

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