Ignorance in infectious diseases: The case of AIDS, Kaposi sarcoma, and lymphology

From the perspective of The University of Arizona's innovative Curriculum o n Medical (and Other) Ignorance focusing on "what we know we don't know, do n't know we don't know, and think we know but don't," the shifting terrain of information-knowledge-ignorance of AIDS (a disorder involving, to variou s incompletely understood degrees, the four components of the lymphatic sys tem-lymph, lymphatics, lymphocytes, and lymph nodes) and Kaposi sarcoma (a lymphedemogenic lesion thought to arise from transdifferentiated lymphatic endothelium) is surveyed by pinpointing some key unanswered questions that have been raised over the course of the epidemic and pointedly in past Inte rnational Congresses of Lymphology. These questions are placed in the conte xt of general ignorance about infectious diseases and the relationship of " germ" to "terrain" through the "blood-tissue-lymph loop." A framework is su ggested for an "ignorance agenda" encompassing basic biology, clinical mana gement, and societal issues.