Think of a messengerRNA (mRNA) vaccine as a fake blueprint from the architect (the cell’s native DNA). The bogus blueprint instructs the cell’s contractors (ribosomes) to build the spike protein structure. A neighborhood copper (a lymphocyte) smells something fishy about the design (the foreign antigen) and calls over a few armed (with antibodies) buds to clean up the block (the host tissue).
[Excuse our dust - Build we must for a greater New York]
A squad of more coppers (lymphocytes) arrive to level buildings (the host tissue) decorated with the spike protein.
Urban (tissue) renewal becomes a de novo auto-immune condition.
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Poetic license was taken in the above fable.