realized in characteristic of inheres in location of role material entity infectious agent transporter role Albert Goldfain Alexander Diehl The role is realized in a process that transfers an infectious organism from one location to another. Lindsay Cowell A role borne by a material entity in virtue of the fact that an infectious agent is located in or on the entity and the entity has the capability to transfer (either actively or passively) the infectious agent from one location to another. reservoir of infectious agent role infectious agent portal of entry role infectious agent portal of exit role disinfectant role antiseptic role primary infection role secondary infection role infectious agent host role source of infection role indirect