Its not additive, the mRNA platform demonstrated T-cell immunity immunity (Memory immunity) at about 8 weeks. I believe that as the antibodies diminished in infected people, T-cell immunity was also found.
In the studies, the second shot of the series was what drove t-cell stimulation. Hence the reason for the second shot
J&J the single shot platform with dead viral particles stimulates antibodies, but the question is does it stimulate memory. Probably not, ergo the single shot looks more like a yearly vaccine.
RE: Its not additive, the mRNA platform demonstrated T-cell immunity immunity (Memory immunity) at about 8 weeks.
OK, if the body will gain Memory immunity, meaning it “remembers” the invader, will this memory last a lifetime?
As an analogy, I remember my first girlfriend from 40 years ago and saw her after 40 years. Still remember her. Is this the same kind of memory?
Second question, will this memory immunity only be good for one variant of the virus? That is, do they need to develop another vaccine for every new variant?
I might remember my girlfriend from 40 years ago, but if she has a sister who looks closely like her, I am not sure I will recognize her.