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BACKGROUND Syphilis is a ****ually transmitted infection (STI) transmitted from person to person mainly by ****ual intercourse or through vertical transmission during pregnancy. Female **** workers (FSWs) are exposed especially to syphilis infection, and besides all the efforts to control the spread of STIs, syphilis prevalence is still rising, mainly occurring in low-income countries. This study aimed to investigate the syphilis prevalence, demographic characteristics and ****ual habits among FSWs in the Amazon region of Brazil. METHODS A