[From the Belle Époque to the city of vice: the fight against syphilis in Belém, Pará, 1921-1924].

This article analyzes the fight against syphilis in Belém, capital of the Brazilian state of Pará, between 1921 and 1924. When Instituto de Profilaxia e Doenças Venéreas (Institute for Prophylaxis and Venereal Diseases) was founded, headed by Dr. Heraclídes de Souza Araújo, many restrictions were imposed on prostitution in a bid to make prostitutes partners in the city's sanitation reform.