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.