And that essentially ensures that all that pathogenic antigen is completely destroyed by the antibodies in our blood. Now, in the case of the primary response, the major immunoglobulin was immunoglobulin M. But in the case of our secondary response, the major immunoglobulin is immunoglobulin G. So once again, following the first infection, the immune system will produce memory cells that will carry that copy of the antibody that is specific to that particular antigen. And when the antigen reinfects our body the second time we're already going to have that antigen, that antibody circulating inside our blood. And so that will create a much quicker, a much more rapid response with a shorter latent period because of those memory B cells. In addition, the amount of antibodies that is formed will be much greater. And actually we're going to need a much lower concentration of antigen to elicit a secondary response than to elicit a primary response.