Here is what I’ve gathered on how this vaccine works.
A fragment of the RNA from the ‘rona virus is injected into muscle tissue. Specifically, the RNA for the “spike protien” that is unique to the ‘rona and is the method of infection of healthy cells. The fragment causes the “spike protien” to be added to your cells in the area of the injection. Your body soon recognizes this cell mutation and kills cells with this extra spike protien. Any symptoms you may experience from the injection is resulting from your immune response to these changed cells. Next time your body sees this spike protien on a cell, it will destroy the cell - presumably a ‘rona virus cell.
A fragment of the RNA from the ‘rona virus is injected into muscle tissue. Specifically, the RNA for the “spike protien” that is unique to the ‘rona and is the method of infection of healthy cells. The fragment causes the “spike protien” to be added to your cells in the area of the injection.
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It is actually an injection containing mRNA or messenger RNA. Think of mRNA as basically a set of instructions for your body to begin to assemble certain proteins. In this case the spike protein that looks like the Covid spike protein. The body reacts to it as “alien” and triggers production of anti-bodies to destroy it. The anti-bodies then provide the future protection against Covid.
https://www.umassmed.edu/news/news-archives/2020/12/inside-the-new-mrna-vaccines-for-covid-19/