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A questionnaire was given to female sex workers in order to obtain information about demographic, socioeconomic and behavioral variables. The mean age of participants was 23 years, varying from 13 to 64 years. A high spatial mobility was observed, with Complete absence of previous vaccine against hepatitis B was referred by Overall, the presence of any hepatitis B marker was observed in participants prevalence of The logistic regression analysis showed association between hepatitis B markers and the following co-variables: Hepatitis B; Prevalence; Sex workers; Prostitutes.
The first evidence that hepatitis B can be transmitted by the sex route dates back to the early seventies, with the virus being isolated from saliva, semen 1 and vaginal secretions 2 , and being frequently detected in patients seen at clinics of sexually transmitted diseases 3.
The hypothesis of sexual transmission eventually gained support from investigations involving persons with intensive exposure, such as sex workers 4 and male homosexuals 5. However, the marginalization and discrimination which these groups always suffer caused them to receive little attention from investigators in the health area 6.
The dissemination of the acquired immunodeficiency syndrome aids , starting in the 's, was a crucial fact for sex workers SW to start to be investigated more frequently.
Because of the similarity of the mechanisms of transmission and, consequently, of the more vulnerable groups, research on aids indirectly provided information about behavioral and biological aspects related to the transmission of hepatitis B.