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Prevalence and factors associated with trichomonas vaginalis infection among female sex workers in Togo, 2017

BMC Infectious Diseases volume 21, Article number: 775 (2021) Cite this article

Abstract

Background

The aim of this study was to estimate the prevalence and factors associated with Trichomonas vaginalis (T. vaginalis) among female sex workers (FSW) in Togo in 2017. A cross-sectional bio-behavioral study was conducted from August to October 2017 using a respondent-driven sampling method in four cities in Togo.

Method

A standardized questionnaire was used to record socio-demographic data and sexual behavior patterns. T. vaginalis detection by molecular biology tests was performed using Allplex STI Essential Assay which detect also 6 others micro-organisms. A blood sample was drawn and serological test using SD Bioline Duo VIH/Syphilis rapid test was performed for Human immunodeficiency virus (HIV) and syphilis testing.

Results

A total of 310 FSW with median age 25 years, interquartile range (IQR) [21–32 years] were included. The prevalence of T. vaginalis was 6.5% (95%CI = [4.1–9.9]) and, overall, prevalence of other STI ranged from 4.2% (95%CI = [2.3–7.2]) for N. gonorrhoeae to 10.6% (95% CI = [7.5–14.7]) for HIV. Binary logistic regression was conducted to assess factors associated with T. vaginalis infection. Living in Lomé (aOR = 3.19; 95%CI = [1.11–11.49]), having had sexual intercourse before the age of 18 (aOR = 5.72; 95%CI = [1.13–10.89]), and being infected with C. trachomatis (aOR = 3.74; 95%CI = [2.95–12.25]) were factors associated with T. vaginalis among FSW.

Conclusion

The prevalence of T. vaginalis infection using molecular test was low among FSW in Togo. Extensive studies are needed to confirm and to better understand the epidemiology of T. vaginalis among this population and in other populations in Togo.

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Background

Trichomonas vaginalis (T. vaginalis) is the most common, curable parasitic sexually transmitted infection (STI) worldwide affecting both men and women [1]. In 2012, 143 million cases of T. vaginalis had been diagnosed in women aged 15–49 years worldwide, including 17.5 million in Africa [2]. In 2016, Bayesian meta-analysis was used to generate estimates of the prevalence of STI. In women, prevalence estimates for T. vaginalis was 5.3%, for Chlamydia Trachomatis (C. trachomatis) 3.8%, for Neisseria gonorrhoeae (N. gonorrhoeae) 0.9%, and for syphilis 0.5%. In men, prevalence estimates for T. vaginalis was 0.6% which was very low compared to C. trachomatis (2.7%) and N. gonorrhoeae (0.7%) [3]. T. vaginalis vaginal infection in the African region are estimated at 42.8 million, and in the same region, this infection is ten times more common in women than in men [4]. In Africa, data on clinical presentation and microbiological factors associated with T. vaginalis infection are limited [5]. In contrast, multiple studies on T. vaginalis have been performed in other regions of the world [6,7,8,9].

As with most STI, T. vaginalis infection is largely associated with an increased risk in Human immunodeficiency virus (HIV) acquisition [10,11,12,13]. In a meta-analysis of 11 studies, T. vaginalis infection was a risk factor for HIV (95% CI 1.3 to 1.7; p < 0.001) [14]. Data on T. vaginalis are mainly described in pregnant women [15, 16] and few data are available on key populations as populations with high risk of HIV infection. In Lagos (Nigeria), the prevalence of T. vaginalis infection among HIV-positive and HIV-negative pregnant women was 10.0 and 8.1%, respectively (p = 0.559) [17]. In Togo, HIV prevalence is five times higher (10.6%) among female sex workers (FSW) [18]) than in the general population (2.3% [19]).

To our knowledge, no study on T. vaginalis infection using molecular technique has been conducted in Togo, especially among FSW. The aim of this study was to estimate the prevalence and factors associated with T. vaginalis among FSW in Togo.

Methods

Study design and recruitment

Between August and October 2017, a cross-sectional study was conducted among FSWs in Togo. Covering 57,000 km2, Togo is a country located in West Africa with 7.6 million inhabitant in 2018. The HIV prevalence in the general population was estimated at 2.3% in 2018 [19].

Participants were included through the respondent-driven sampling method [20, 21]. FSWs were defined as women who had sex for money as compensation in the previous 12 months. Additional inclusion criteria were being ≥18 years old, living in Togo for more than 3 months, and giving written informed consent [22, 23].

Study procedures and detection of T. vaginalis and other STI

A standardized questionnaire adapted from a Family Health International (FHI) 360 validated guide for bio-behavioral surveys was administered during a face-to face interview to collect information regarding socio-demographic characteristics, risky sexual behaviors.

Cervical swabs collection and venous blood sample as well as biological analyses were described in detail elsewhere [18].

Statistical analysis

Descriptive analyses were performed and results were presented with frequency tabulations and percentages. Prevalence were estimated with their 95% confidence interval (95%CI). Chi-square or Fisher’s exact tests were used to compare categorical variables. In multivariable analysis, logistic regression was conducted to identify factors associated with T. vaginalis infection.

Associations in the regression model were expressed as adjusted odds ratio (AOR) using all variables that had p < 0.20 in the univariable regression. Predictor variables were selected as those found to be relevant according to the literature review. All computations were conducted using R© version 3.4.3 software and the level of significance was set at 5%.

Results

Socio-demographic and clinical characteristics

A total of 310 FSW with median age of 25 years, interquartile range (IQR) [21–32 years] participated in the study. Almost half (46.2%) of them were over 25 years old while around one third (30.3%) were between 21 and 25 years old. More than seven out of ten FSW (76.1%) reported living with their partner and the majority had at least a secondary school level (74.5%). Almost 80% of FSW had their first sexual intercourse before the age of 18. Sociodemographic characteristics according to geographic area are summarized in Table 1 and none of the differences observed were statistically significant.

Table 1 Sociodemographic characteristics of FSW in Togo, N = 310 (2017)
Full size table

Prevalence of T. vaginalis infection and others STI

Table 2 summarizes the prevalence of sexually transmitted infections among FSW in Togo in 2017. The prevalence of T. vaginalis was 6.5% (95%CI = [4.1–9.9]) and, overall, prevalence of other STI ranged from 4.2% (95%CI = [2.3–7.2]) for N. gonorrhoeae to 10.6% (95%CI = [7.5–14.7]) for HIV.

Table 2 Prevalence of Trichomonas vaginalis and other STI among female sex workers in Togo (2017)
Full size table

Factors associated with T. vaginalis infection among FSW

After multivariable adjustment, three factors had a statistically significant positive association with T. vaginalis infection among FSW. FSW living in Lomé (aOR = 3.19; 95%CI = [1.11–11.49]), those having had sexual intercourse before the age of 18 (aOR = 5.72; 95%CI = [1.13–10.89]), and those being infected with C. trachomatis (aOR = 3.74; 95%CI = [2.95–12.25]) were more likely to have a T. vaginalis infection (Table 3).

Table 3 Factors associated with Trichomonas vaginalis among female sex workers in Togo, 2017 (N = 310)
Full size table

Discussion

This study provided an update on the epidemiology of T. vaginalis infection and revealed a prevalence of 6.5% among FSW in Togo. The overall prevalence of other STI were 10.6, 5.5, 6.1 and 4.2% for HIV, M. genitalium, C. Trachomatis and N. gonorrhoeae infections respectively. Among FSW population, risk factors associated with T. vaginalis infection were the geographic area (capital city, Lomé), lower age at first intercourse and infection with C. Trachomatis.

The prevalence of T. vaginalis infection among FSW reported in this study is approximately similar to those reported across other countries, as reported by other studies. In Rwanda, a descriptive cross-sectional study conducted in 2015 among 1168 FSW reported a prevalence of 11.9% [24]. In a 2-year longitudinal study conducted among 350 Kenyan FSW, baseline prevalence of T. vaginalis was 9.2% [25]. In an another prospective cohort study among 352 South African youths including lesbian, gay, bisexual, transgender, and queer (LGBTQ), an overall prevalence of 4.8% has been reported (8.1% among female and 0.7% among male participants) [26]. In a prospective, interventional cohort study of FSW aged 18 to 25 years in Ouagadougou among 321 HIV-uninfected FSW the prevalence of T. vaginalis was 3% [27]. The prevalence of T. vaginalis however was reportedly lower in the general population of women in a prospective study among 302 pregnant women conducted in 2011 in Togo which found a prevalence of T. vaginalis of 3.7% [28]. There is a need for additional effort towards the prevention of STI among FSW, which is an occupational risk in this line of work that could be prevented by the correct and consistent use of condoms. Among FSW, the correct and consistent use of condoms is still a challenge that requires more attention [29, 30].

No other STI, except from C. trachomatis was associated with T. vaginalis infection. There was no association between T. vaginalis and HIV infection which is contrary to results from previous studies. In South Africa, an association was found between T. vaginalis and HIV positive infection (OR = 1.6; p = 0.041) [5]. Another study conducted in Ouagadougou found an association between HIV infection and T. vaginalis (aOR = 9.63; 95% CI: [2.93 to 31.59]) [27]. A meta- analysis of T. vaginalis and HIV infection in sub-Saharan Africa found that individuals infected with T. vaginalis were 1.5 times more likely to acquire HIV compared to individuals not infected with T. vaginalis [14]. However, as corroborated by other studies, C. trachomatis infection (adjusted Prevalence Ratio (aPR) = 8.53; 95%CI = [3.35–21.71]) was identified as a risk factor of T. vaginalis infection in Kenya [25]. In the same study, a significant association was reported between positive HIV status and T. vaginalis infection (aPR = 3.01; 95% CI = [1.45–6.24]). In another study conducted in China, C. trachomatis was associated to T. vaginalis infection (aOR = 2.4 [95% CI: 1.37–4.14]) [31]. The lack of the association between HIV and T vaginalis in our study could be explained by the large access to antiretroviral treatment for the FSW when identified HIV positive, however this information is not collected. In addition, the lack of association between HIV, M. genitalium, C. trachomatis and N. gonorrhoeae infections could be explained by several factors including the limited sample size of the study population. Studies could further explore the relationship between other STI infection and T. vaginalis in high-risk women taking into account the impact of antiretroviral therapy.

Early age at first intercourse was associated with positive T. vaginalis infection in our study. Similar results have been reported by other studies such as in China among 734 FSW (aOR = 1.9 [95% CI: 1.11–3.30]) for starting age in commercial sex before 20 years [31] and in India in 2006 (aOR = 2.09; 95%CI: 1.09–4.00) [32]. Overall prevalence of T. vaginalis among sexually active women aged 15–30 years was 8.5 and 14.4% for women under 50 years at first sex. Another study of a nationally representative sample of 9844 respondents aged 18 to 26 years in the United States found a significantly higher risk of T. vaginalis infection among adolescents and young adults who were younger at the time of their first sexual intercourse [33]. Also consistent with our result, a cross-sectional study conducted in four cities in sub–Saharan Africa (Kisumu, Kenya; Ndola, Zambia; Cotonou, Benin and Yaoundé, Cameroon) among a random sample of 8000 adults (2000 in each city), aged 15–49 years showed a prevalence of T. vaginalis respectively of 29.3% in Kisumu, 34.3% in Ndola, 3.2% in Cotonou and 17.6% in Yaoundé. Early sexual debut (before age 15) was a significantly risk factor associated with T. vaginalis infection in women in Ndola (Zambia) [34]. Specific interventions are needed to delay the age of the first sexual intercourse among FSW and in general population.

Most of studies on T. vaginalis in Africa are conducted in pregnant women and report high prevalence in this population. A nested case-control study in Kenya among pregnant women reported a T. vaginalis infection prevalence of 35.4% (n = 79) [35], while in Nigeria [36] and South Africa [37], the prevalence of T. vaginalis infection among pregnant women was 18.7 and 15.0%, respectively. Hence, in many studies in sub-Saharan Africa, the prevalence of T. vaginalis among women in the general population, especially among pregnant women is higher than that of FSW, as reported in this study. One plausible explanation could be the use of molecular biology test, which is among the most specific for T. vaginalis detection compared to other tests that could be less accurate. Another possible explanation could be the systematic use of treatment in case of genital infection for FSW. In Togo, in case of STI symptoms, syndromic approach which includes the use of azithromycin, ceftriaxone, doxycycline, metronidazole as first line treatment are systematically used in care centers. However, additional and comparative studies are needed to shed light on interventions or hypotheses that could explain it.

To our knowledge, this was the first study reporting prevalence of T. vaginalis infection and other STI among FSW in Togo. Another strength of this study includes the use of a sensitive laboratory assay for the reliable detection of T. vaginalis infection and the relationship with HIV. Finally, our study was the first to assess factors associated with T. vaginalis among FSW in Togo and to provide useful information in order to design specific interventions within these populations.

There were few limitations to this study including the lack of data on treatment use among study participants, which may have certainly impacted observed STI prevalence. In Togo, syndromic approach is used for the treatment of STI among FSW and in general population. Furthermore, the standardized questionnaire submitted to participants can be biased (memory bias and social desirability bias) by the fact that it was based on self-reporting and may not reflect the overall sexual activity. Additionally, due to the cross-sectional nature of this analysis, we are unable to analyze the causality and temporality of the associations between T. vaginalis infection and other factors.

Conclusion

The prevalence of T. vaginalis infection using molecular test among FSW in Togo was low. However, extensive studies are needed to confirm and better understand the epidemiology of T. vaginalis in these populations in Togo. Comprehensive health promotion programs for FSW and active surveillance that include preventive education are needed.

Availability of data and materials

The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.

Abbreviations

95%CI:

95% Confidence interval

aOR:

Adjusted odds ratio

T. vaginalis :

Trichomonas vaginalis

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Acknowledgements

We are thankful to the FSW who accepted to participate in this study and to the final year medical students of the ‘Faculté des Sciences de la Santé-Université de Lomé’ who performed data collection for the study.

Funding

This work was supported by the “Centre Africain de Recherche en Epidemiologie et en Santé Publique (CARESP)” (African Center for Epidemiology and Public Health Research) and the “Programme National de Lutte contre le sida et les IST du Togo (PNLS/IST-Togo)” (Togo National HIV/AIDS and STI Control Program). CARESP funded the study design, data collection, data analysis and manuscript writing. The PNLS/IST-Togo provided the tests for screening and the logistics for data collection.

Author information

Authors and Affiliations

  1. Centre Africain de Recherche en Epidémiologie et en Santé Publique (CARESP), Lomé, Togo

    Martin Kouame TCHANKONI, Arnold Junior SADIO, Fifonsi Adjidossi GBEASOR-KOMLANVI, Wendpouiré Ida Carine ZIDA-COMPAORE & Didier Koumavi EKOUEVI

  2. Centre de recherche PACCI-Site ANRS Côte d’Ivoire, Abidjan, Côte d’Ivoire

    Alexandra Marie Bitty-Anderson

  3. Département de Santé Publique, Université de Lomé, Faculté des Sciences de la Santé, Lomé, Togo

    Arnold Junior SADIO, Fifonsi Adjidossi GBEASOR-KOMLANVI & Didier Koumavi EKOUEVI

  4. Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France

    Valentine Marie FERRÉ & Charlotte CHARPENTIER

  5. Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France

    Valentine Marie FERRÉ & Charlotte CHARPENTIER

  6. Département des Sciences Fondamentales, Université de Lomé, Faculté des Sciences de la Santé, Lomé, Togo

    Ameyo Monique DORKENOO

  7. CHU Sylvanus Olympio, Service de Dermatologie et Vénérologie, Université de Lomé, Lomé, Togo

    Bayaki SAKA

  8. Programme national de lutte contre le sida, les hépatites virales, et les infections sexuellement transmissibles, Lomé, Togo

    Anoumou Claver DAGNRA

  9. ISPED, Université de Bordeaux & Centre INSERM U1219 - Bordeaux Population Health, Bordeaux, France

    Didier Koumavi EKOUEVI

  10. Université de Lomé, Laboratoire de Biologie Moléculaire et d’Immunologie, Lomé, Togo

    Didier Koumavi EKOUEVI

Authors
  1. Martin Kouame TCHANKONI
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  2. Alexandra Marie Bitty-Anderson
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  3. Arnold Junior SADIO
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  4. Fifonsi Adjidossi GBEASOR-KOMLANVI
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  5. Valentine Marie FERRÉ
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  6. Wendpouiré Ida Carine ZIDA-COMPAORE
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  7. Ameyo Monique DORKENOO
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  8. Bayaki SAKA
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  9. Anoumou Claver DAGNRA
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  10. Charlotte CHARPENTIER
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  11. Didier Koumavi EKOUEVI
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Contributions

MKT, AMBA and DKE conceived this study and participated in its design and coordination. AJS, VMF, WICZC, FAGK, AMD, BS, ACD, CC participated in the study design and data collection. MKT and DKE performed statistical analyses. MKT, AMBA and WICZC wrote the first draft of the manuscript and AJS, VMF, WICZC, FAGK, AMD, BS, ACD, CC and DKE subsequently revised the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Didier Koumavi EKOUEVI.

Ethics declarations

Ethics approval and consent to participate

Ethical approval was obtained from the national Bioethics Committee for Health Research of Togo (ethics clearance number 19/2017/CBRS of 22 June 2017) and each participant included in the study signed a written consent signed.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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TCHANKONI, M.K., Bitty-Anderson, A.M., SADIO, A.J. et al. Prevalence and factors associated with trichomonas vaginalis infection among female sex workers in Togo, 2017. BMC Infect Dis 21, 775 (2021). https://0-doi-org.brum.beds.ac.uk/10.1186/s12879-021-06432-w

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  • DOI: https://0-doi-org.brum.beds.ac.uk/10.1186/s12879-021-06432-w

Keywords

BMC Infectious Diseases

ISSN: 1471-2334

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