Abstract
This paper examines the action of medical doctors and policemen during the yellow fever epidemic in Buenos Aires (1871). Even though during the XIX century epidemics were frequent, the yellow fever one constitutes a break, not only because of its scope and material effects on the city, but also because it opened a crisis of hegemonic discourses. In particular, the paper scrutinizes the effects of the yellow fever epidemics on the figures of doctors and policemen, who were redesigned in light of tropes of heroism and sacrifice.