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Research into public communication of HIV/AIDS prevention allows to emphasise the central role of associations of struggle against HIV/AIDS at the cognitive, symbolic and emotional levels, and accordingly, in the definition of the strategies that have been successively implemented. But the adoption of these factors by all the involved parties lowers the visibility of the central actor and paradoxically, becomes one of the main reasons of placing it aside. The data presented allow to revisit the minority influence processes and to actualise them in a concrete social setting. They shed light on different and linked dimensions of cognitive, but ethical, emotional and symbolic factors. Regarding the question of influence, they allow to sort out influence and power, as the former is detrimental to the latter.