What are the key stages in phagocytosis?

First, the phagocyte (a specialised type of white blood cell) will recognise the pathogen by a process called chemoattraction -- this is essentially where the phagocyte 'follows' a chemical trail left by the pathogen.The phagocyte will then perform phagocytosis (it will bind to the pathogen and engulf it) to form a specialised vesicle inside the phagocyte known as a phagosome.A lysosome (a vesicle produced by the phagocyte) containing digestive enzymes called lysozymes then fuses with the phagosome. This releases the lysozymes into the phagosome, where they digest the pathogen.Once the pathogen has been digested, the phagocyte will display the antigens from the pathogen's surface on its own cell membrane in order to activate other immune system cells. This is known as antigen presentation.