isolate organism role pathogen role OBI pathogen role 6 April 2009: from the Vaccine Community GROUP: Role Branch Pathogen: An agent of disease. A disease producer. The term pathogen most commonly is used to refer to infectious organisms. These include bacteria (such as staph), viruses (such as HIV), and fungi (such as yeast). Less commonly, pathogen refers to a noninfectious agent of disease such as a chemical. http://www.medterms.com/script/main/art.asp?articlekey=6383 pathogen role is a role which inheres in an organism and realized in the process of disease course in the organism bearing host role caused by the organism bearing pathogen role metadata complete