This study monitored the protocol of a clinical trial for experimental anti-HIV vaccines in Rio de Janeiro, Brazil, focusing on the recruitment, selection, and follow-up of volunteers. The techniques included observation of the research center's routine and interviews with health professionals and volunteers. The results show that the trial is a collective activity, in which constant negotiations are needed between the protocol requirements and what can, should, or must be adapted in order for it to work, as a function of: prolonged time before the trial's approval by the regulatory bodies, difficulties in recruiting volunteers, and even larger problems like discontinuity in the vaccines (which occurred in a specific protocol). The article discusses how the protocol's application extends beyond the technical and scientific "script", transforming it into a boundary object between different social worlds. The protocol is adapted according to a local order, based on the dynamics of social relations and the constant interrelationship between science, society, technique, and politics.
AIDS Vaccines; Voluntary Programs; Clinical Trials as Topic; Acquired Immunodeficiency Syndrome