Primary and Secondary Immune Responses

The Primary Immune Response

When an antigen enters the body for the first time it activates the immune system. This is the primary response and is slow due to the lack of B lymphocytes that can make the antibody needed to bind to it. Eventually they will produce enough and overcome infection. 

After exposure, T and B lymphocytes produce memory cells. Memory T lymphocytes remember antigen. Memory B lymphocytes record…