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. 2017 Feb 3;12(2):e0171303.
doi: 10.1371/journal.pone.0171303. eCollection 2017.

HTLV-1 is predominantly sexually transmitted in Salvador, the city with the highest HTLV-1 prevalence in Brazil

David Nunes  1 , Ney Boa-Sorte  1 , Maria Fernanda Rios Grassi  1   2 , Graham P Taylor  3 , Maria Gloria Teixeira  4 , Mauricio L Barreto  2   4 , Inês Dourado  3 , Bernardo Galvão-Castro  1   2
Affiliations
Free PMC article

HTLV-1 is predominantly sexually transmitted in Salvador, the city with the highest HTLV-1 prevalence in Brazil

David Nunes et al. PLoS One. .
Free PMC article

Abstract

Background: Salvador is the city with the highest number of HTLV-1 infected individuals in Brazil, yet the main route of HTLV-1 transmission is unknown.

Objective: To investigate the association of syphilis infection as a proxy for sexual transmission of HTLV-1 infection in the general population of this city.

Methods: A cross sectional population-based study was conducted with 3,451 serum samples obtained by a representative simple random sampling. Data on gender, age, income, and years of education were collected by questionnaire and the presence of HTLV, HIV and Treponema pallidum infection was determined by serology. Logistic regression analysis was used to evaluate the independent effect of the potential explanatory variables to HTLV-1 infection and Odds Ratios (OR) and 95% CI were calculated.

Results: The majority of studied individuals were female (56.4%), had less than 7 years of education (55.3%) and earned two or less minimum wages (52.0%). The overall prevalence of HTLV-1 was 1.48% (51/3,451; 95% CI: 1.10%- 1.94%), which increased with age. Only three persons younger than 17 (3/958; 0.31%; CI 95% 0.06-0.91) years were infected by HTLV-1. Among the 45 syphilis positives, 12 (26.7%) were HTLV positive, while among 21 HIV positives, only one (4.8%) was HTLV positive. HTLV-1 infection was found to be associated with syphilis infection (ORADJUSTED 36.77; 95% CI 14.96-90.41).

Conclusion: The data presented herein indicate that horizontal transmission between adults is the main route of HTLV-1 infection in the general population of Salvador and that this is likely to occur through sexual contact.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Prevalence of HTLV-1 infection among males and females in Salvador, Bahia-Brazil, stratified by age in years.
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References

    1. Gessain A, Cassar O. Epidemiological Aspects and World Distribution of HTLV-1 Infection. Front Microbiol. 2012;3:388 10.3389/fmicb.2012.00388 - DOI - PMC - PubMed
    1. European Centre for Disease Prevention and Control. Risk assessment of HTLV-1/2 transmission by tissue/cell transplantation Part 2: Risks by tissue type, impact of processing and effectiveness of prevention measures. Stockholm: ECDC; 2012.
    1. Rafatpanah H, Hedayati-Moghaddam MR, Fathimoghadam F, Bidkhori HR, Shamsian SK, Ahmadi S, et al. High prevalence of HTLV-1 infection in Mashhad, Northeast Iran: a population-based seroepidemiology survey. J Clin Virol. 2011;52(3):172–6. 10.1016/j.jcv.2011.07.004 - DOI - PubMed
    1. Yoshida M, Miyoshi I, Hinuma Y. Isolation and characterization of retrovirus from cell lines of human adult T-cell leukemia and its implication in the disease. Proc Natl Acad Sci U S A. 1982;79(6):2031–5. - PMC - PubMed
    1. Gessain A, Barin F, Vernant JC, Gout O, Maurs L, Calender A, et al. Antibodies to human T-lymphotropic virus type-I in patients with tropical spastic paraparesis. Lancet. 1985;2(8452):407–10. - PubMed

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Grants and funding

This work was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and by Fundação de Amparo à pesquisa do Estado da Bahia (FAPESB). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.