Primary immune response

An antigen enters the body for the first time and it activates the immune system ((PRIMARY RESPONSE))

As there aren't many B-cells that are able to make the antibody to bind to the pathogen, the response is slow

The sufferer will exhibit symptoms as the body produces enough of the correct antibody to destroy the pathogen

The T-cells and B-cells both produce memory cells which remain in the body. Memory T-cells remember the specific antigen and will recognise it if it enters the body again. Memory B-cells record the specific antibodies needed to bind the antigen

The person is now immune as the body can quickly repspnd if exposed to the pathogen a second time