What happens in Vaccination?

-A Dead, Inactive, or a Weakened Pathogen is Injected that has the SAME Pathogens as the Regular Pathogen has -So the Immune System Deals with it, because its Inside the Body and is 'Foreign' so B-Lymphocytes make Antibodies to Eradicate the Pathogen -But, the Trick is that some of the Lymphocytes stay in the Blood as Memory Cells that will just Remember the Pathogen's Antibodies [This happens also in Regular Scenarios] which means you will be Immunised against that Pathogen - Regular or Tainted