The Janssen (J&J) is non-messenger RNA, but it is not non-spike protein, being the adenovirus “option”.
Novavax is also not non-spike-protein either.
Yes, the Novavax has snippets of spike protein as antigen -— however, it is a finite non-replicating amount that does not splice into the genome at any point as far as I can tell from the scientific literature I have seen.
Doesn’t the J&J use the adenovirus as a vector to get the host cells to replicate the spike protein in vivo?
Are you saying the J&J is the same as Novavax?
The Janssen (J&J) is non-messenger RNA
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That’s not quite right. J&J does involve mRNA coding for the spike protein. It just adds a step. Namely, it has an adenovirus enter the cell nucleus with a snippet of DNA which causes the mRNA to be produced, and from there the process is the same.
Novavax is fundamentally different from J&J and the other mRNA vaccines in that it does not at any point cause your cells to produce the spike protein. Instead (as you said) the spikes are cultivated in the lab using moth cells and then injected into you.