Your Immune System. Infectious Disease. Disease- any change, other than an injury, that disrupts the normal functions of the body Pathogens- disease-causing agents Bacteria Viruses Fungi Environmental agents Inherited agents. Agents of Disease.
collectively called phagocytes -- converge on the invaders and proceed to literally "eat them up." Generally the phagocytes will build up in one place, causing what we call puss -- in order to eliminate the waste.