This is not intended to either condone or not condone the vaccine, but just wanted add the mechanism proposed for action for the 2 main ones (Moderna and Pfizer). They are mRNA treatments for which mRNA codes for the translation to a protein. This is true for everything that is transcribed from DNA to mRNA. In this case, the protein expressed was designed to resemble the spike proteins present on the COVID-19 virus. As a result, it was expected the development of these proteins will cause an immune response that will produce antibodies should the actual virus become present.
Since this technology is fairly new, other factors outside of just the spike proteins on the actual virus may have no affect from the “vaccine” treatment. Time will tell, but to me this isn’t a typical vaccine that completely causes immunity from it, but more like the flu shot, which is the best educated guess each year what the sequence will be, as it often mutates.