Do Vaccines contain antigens for the bacteriavirus being vaccinated against and specifically target the B and T cells?

Yes, vaccines contain antigens derived from the bacteria or virus they aim to protect against. These antigens stimulate the immune system, specifically targeting B and T cells, which are crucial for developing an adaptive immune response. B cells produce antibodies against the antigens, while T cells help in recognizing and destroying infected cells. This targeted response prepares the immune system to respond more effectively if exposed to the actual pathogen in the future.