One of the first cells to respond to an infection will be a phagocyteThese migrate to the pathogen (foreign object with potential to cause disease)They engulf the phagocyte in a process known as phagocytosis The pathogen is broken down inside itThis prevents the further spread of the pathogen the broken parts of the pathogen are displayed on the phagocytes surface receptors which are like an antenna dish, in order to inform the lymphocyte of what is has come across
A specific lymphocyte will recognise this and divide, and help produce antibodiesantibodies help neutralise the pathogen incase it comes back in the future