Unpredicted HTLV-1 infection in female sex worker from Imbituba, Santa Catarina, Brazil.

Recently, some of us presented data concerning HIV frequency in female sex workers (FSW) from the port city of Imbituba, Santa Catarina (SC), Southern Brazil. Out of 90 FSW, six (6.7%) were found to be HIV-positive, and significant association were found between HIV infection and the number of clients attended per day (p = 0.008), and sexual relations without frequent use of condoms (p = 0.015). Now, in order to add some information concerning to other human retroviruses (human T-lymphotropic virus type 1 HTLV-1, and human T-lymphotropic virus type 2 HTLV-2) which share the same routes of virus transmission/acquisitions (i.e., mother-to-child transmission, sexual contact, blood transfusion, contaminated needles sharing among injecting drug users IDU), we conducted the present study. Using enzyme immunoassays (EIA) screening tests ((VironostikaTM HTLV-I/II, BioMeriéux, Bostel, The Netherlands, and MurexTM HTLV-I+II, Abbott, Dartford Kent England, UK), and Western Blotting (WB) confirmatory test (HTLV BLOT 2.4TM, Abbott Murex, Singapore System, Abbott, Delkenhein, Germany), we were able to detect one case of HTLV-1 infection. The socio-demographic as well the comportamental characteristics of the HTLV-1-infected FSW are as follow: female of 25 years of age, white color, birth place in Imbituba, four-year old son who was breastfed, incomplete elementary school, no steady partner, one month in prostitution, one client per day, vaginal and oral sexual practices, no sex during menses, no use of condoms, use of alcohol, sex with IDU, and no blood transfusion. All these data were obtained after she signed the informed consent, and based on the interview and the answers of a questionnaire. Subsequently, when she returned to receive the HIV and HTLV serological results, another blood sample was collected and confirmed HTLV-1 infection. At this time, she was attended by physicians and no HTLV-1-associated disease was detected. On the other hand, she was pregnant, and she was advised not to breastfeed her offspring. Since then, she has been visited by the non-governmental organization called Industry of Solidarity (ISO) working group, and medical care has been conducted in an outpatient site in Tubarão, SC, Brazil. As previously described, HTLV-1 is associated with several diseases such as adult T-cell leukemia/lymphoma (ATL), HTLV-1-associated myelopathy (HAM) also known as tropical spastic paraparesis (TSP), infective dermatitis in children, and uveitis. Differently to those occurring in elderly patients from Japan where HTLV-1 has been endemic, in Bahia, Brazil HTLV-1 has been detected in younger people, including some cases diagnosed in adolescents who presented severe eczema during childhood. In Brazil, the great number of HTLV-1 and HTLV-2 seropositive individuals besides the severity of HTLV-1-associated diseases, prompted the government and physicians to elaborate in 2004, a guideline for counseling persons infected with HTLV-1 and HTLV-2. Of note, Santa Catarina presents the lowest prevalence rate of HTLV-1/2 in Brazil, estimated in 0.4/1,000 inhabitants. We do not know the means of HTLV-1 acquisition by this FSW from Imbituba, SC, but since she denied the use of intravenous illicit drugs and previous blood transfusion, and because she does not belong to HTLV-1 endemic populations from Brazil or elsewhere, we could speculate that the sexual practices (vaginal and oral sex without use of condom) was the major via of virus acquisition. In accordance to this, during the interview she mentioned the presence of ulcers in vagina, which could propitiate the virus entrance during a sexual contact with an HTLV-1infected man. Several reports pointed unprotected sexual contact mostly with IDU, and histories of sexually transmitted diseases as risk factors for acquiring such retroviruses; these seem to be the causes of infection in the index case. Interestingly, this FSW resulted HIV-1-noninfected; in spite of this, she was counseled regarding HIV-1, HTLV-1 and HTLV-2 infections, especially concerning sexual and vertical transmission.