... a coherent and fascinating social analysis of AIDS-related knowledge, examining the social facts of knowledge production and developments interior to communities of science." Medical Humanities Review ... a multilayered, composite approach that involves multisited ethnographic research in different spheres of the collective responses to AIDS... " -Choice The response to AIDS from various groups in developing knowledge of and about this health crisis is the focus of this revealing work. Rio de Janeiro serves as an observation point for the study of the intersecting worlds of activism, clinical practice, and biomedical research.