Dados científicos como argumento: o caso da redução de parceiros sexuais na prevenção ao HIV no Brasil

This article dicusses the use of scientific facts as argument for a 1999 Brazilian debate about the legitimacy of an official aids prevention policy. It seeks to defamiliarized a common aids argumentative practice which uses a classification of a scientific public health measure as a main legitimacy judgement. It is argued that it is peoples’ negotiations and objects’ mobilization that gives legitimacy to the implementation of a prevention estrategy – acccording to a Social Psicology of science with a construcionist point of view.