HOW DOES THE COVID-19 VACCINE WORK? PART IV (FINAL) In summary, the mRNA vaccines of Pfizer, Moderna and Johnson & Johnson allow a very robust immune response or high rate of effective prevention of COVID-19 because of the unique amplification of the dual pathway of cytotoxic T cell and B cell response that is coordinated by the helper T cells. Other non-mRNA vaccines of the past amplifies only the pathway of the B cell response and not the pathway of the cytotoxic T cells. The B cell response or the production and then attachment of antibodies to a wide range of spike proteins of the surface of COVID-19 virus eliminates the virus even before it has the chance to find and infect a cell in the human body. If the virus somehow survives the B cell response and is still able to infect a cell then the cytotoxic T cells will immediately recognize the infected cell and eliminate it before the virus can replicate itself inside the cell. https://dryangwaikiki.com/ https://m.facebook.com/Sung-S-Yang-MD-108650290966870/