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Basically, what I have seen of these RNA type vaccines is that they insert spike sequences on the cells which basically throw a spanner in the viral replication machinery once Sars-CoV-2 has entered a host and this stops it in its tracks.
What you are referring to is some type of "carrier" RNA strand which acts to insert an accompanying set of proteins which jam up the replication works. It's interesting. I'd like to see it's mode of methodology when it becomes available.
I posted some comments on the drug "remdesivir" a while back, which works by similar protocols, but without the RNA insertion.
Click on the functional groups marked 1-5 in this link for a better understanding:
Anatomy of a molecule: What makes remdesivir unique?
Clinical trials around the world are testing remdesivir, a nucleotide analog, for possible effects against the novel coronavirus. We asked some experts what makes the molecule interesting.www.asbmb.org
*Take particular note of functional group 2 as the insertion mechanism in to the viral replication template. I suspect your vaccine works via a similiar route.
Thanks. If I can get more information on this specific trial I will share it.