characteristic of inheres in participates in role symbiosis, encompassing mutualism through parasitism symbiont role Lindsay Cowell The role is realized in symbiosis. A role borne by an organism in symbiosis. Albert Goldfain Alexander Diehl pathogen role infectious agent transporter role 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 host role source of infection role organism