No. Natural immunity is just that -- natural, not built. You're born with it.This is foreign language to me. Do you mean someone can build natural immunity without needing to have COVID first?
They're two very different things.I usually hear it as herd immunity not natural immunity.
Natural immunity is the result of an innate genetic (RNA or DNA) sequence -- on a gene.
Acquired immunity is caused by the immune system being activated by contact with an antigen -- a potential infectious agent. The immune system produces antibodies, "keyed" to a specific antigen, and remembers them so it can produce more antibodies faster, the next time the antigen's encountered.
The mRNA vaccines work slightly differently, though. They don't go through the usual keying and memory producing sequence, but sort of inject the memory code, itself, into the body, pre-made.
Herd immunity isn't an individual's biological immunity, it's a statistical ratio; its maths.
If an infected individual, on average, infects two other people, the infection will spread and increase in the population. If he infects an average of just one other person, the infection will persist, but not grow. If he infects less than one other person, the infection will die out, or become a rarity, even if some in the 'herd' remain susceptible.
Vaccination attempts to reduce the transmission rate to less than 1:1 by reducing the susceptible population to the point that infected people pass the infection on -- on average -- to less than one person apiece.
I can explain more if you want.