Now, the pathogen has been altered in some way or form. It has been inoculated. And what that means is we change that pathogen in the laboratory and we change it in such a way to ensure that it does not damage the body as severely as it would normally when we are infected by that pathogen in a natural way. Now, in both of these cases, in the natural case and in the artificial case we obtain the same exact result. We essentially either inject or somehow obtain these antigens. Our immune system begins to develop antibodies as well as memory cells that contain a copy of that antibody in case we are ever reinfected.