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Table of Contents
ORIGINAL ARTICLE
Year : 2019  |  Volume : 10  |  Issue : 2  |  Page : 136-140

Prevalence and associated risk factors of Chlamydia trachomatis among gynecology clinic attendees in a tertiary institution in Ogun State, Nigeria


1 Department of Medical Microbiology, Babcock University Teaching Hospital, Ilishan-Remo, Ogun State, Nigeria
2 Department of Medical Microbiology, University of Abuja, Federal Capital Territory, Abuja, Nigeria
3 Department of Obstetrics and Gynaecology, College of Medicine, University of Ibadan, Ibadan, Oyo State, Nigeria
4 Department of Pathology, University College Hospital, Ibadan, Oyo State, Nigeria

Date of Submission16-May-2019
Date of Decision29-May-2019
Date of Acceptance01-Jul-2019
Date of Web Publication6-Dec-2019

Correspondence Address:
Dr. Mustapha Akanji Ajani
Department of Pathology, University College Hospital, Ibadan, Oyo State
Nigeria
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/atp.atp_17_19

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  Abstract 

Background: Chlamydia trachomatis is one of the most prevalent bacterial-causing urogenital infections in men and women worldwide. There have been increasing reports of the prevalence of C. trachomatis in Nigeria.
Aims: This study aimed to detect the prevalence of C. trachomatis seromarkers immunoglobulin G (IgG) and immunoglobulin A (IgA) and also to determine their associated risk factors among gynecology clinic attendees in the Babcock University Teaching Hospital, Ilishan-Remo, Ogun State of Nigeria. Materials and Methods: This was a cross-sectional study involving 145 consenting attendees of gynecology clinic of the hospital. Blood samples were collected and tested for C. trachomatis IgG and IgA using the enzyme-linked immunosorbent assay technique. Sociodemographic and sex behavioral factors were obtained by the interviewer-based questionnaires, whereas statistical analysis was done using SPSS version 23. Results: Overall prevalence of combined IgG and IgA was 46 (31.7%). Among the infected, 30 (65.2%) were young women aged 15–25 years and majority, 109 (75%), had never used condom while 83 (57.2%) had only one sex partner in the preceding 3 months. Twenty-three (15.9%) had a positive history of sexually transmitted infection (STIs), whereas 75 (51.7%) had ≥2 lifetime sex partners. Factors associated with the occurrence of both seromarkers on bivariate analysis included the previous history of STI and number of lifetime sex partners (P < 0.05), but with further analysis, only lifetime sex partners remained statistically significant (odds ratio = 5.63, confidence interval = 1.09–29.05, P = 0.007). Conclusion: There was a high prevalence of active, chronic, and persistent C. trachomatis infection with number of lifetime sex partner being a significant risk factor among our clinic attendees in Ogun State. Appropriate sex education should be encouraged among young people to reduce the burden of the infection and its attendant sequelae in our community.

Keywords: Chlamydia trachomatis, enzyme-linked immunosorbent assay, immunoglobulin A, immunoglobulin G, seromarker


How to cite this article:
Ajani TA, Elikwu CJ, Anaedobe CG, Olusesan Oluwasola TA, Ajani MA. Prevalence and associated risk factors of Chlamydia trachomatis among gynecology clinic attendees in a tertiary institution in Ogun State, Nigeria. Ann Trop Pathol 2019;10:136-40

How to cite this URL:
Ajani TA, Elikwu CJ, Anaedobe CG, Olusesan Oluwasola TA, Ajani MA. Prevalence and associated risk factors of Chlamydia trachomatis among gynecology clinic attendees in a tertiary institution in Ogun State, Nigeria. Ann Trop Pathol [serial online] 2019 [cited 2020 Mar 31];10:136-40. Available from: http://www.atpjournal.org/text.asp?2019/10/2/136/272421


  Introduction Top


Chlamydia trachomatis is one of the most prevalent bacteria-causing urogenital infections in men and women worldwide.[1] The World Health Organization reported that 131 million people are infected with Chlamydia each year.[2] In Africa, 15 million new cases of C. trachomatis infection are reported, whereas in Southern Asia, 45 million new cases are reported every year.[3] Chlamydia infection in females can be asymptomatic or presents with subtle unnoticed symptoms that favors the undetected spread and chronicity of the infection,[4] ultimately resulting in severe complications such as pelvic inflammatory diseases (PID), chronic pelvic pain, salpingitis, ectopic pregnancy, infertility, and recurrent abortions.[4],[5],[6],[7] In a review of Chlamydia infection among asymptomatic European women, a prevalence of 1.7%–17% was reported.[8] In Nigeria, 13.3% prevalence was reported in Benin city, 7.3% in Ibadan, and 33% in Kano among asymptomatic volunteers.[9],[10],[11]

Several risk factors predisposing to C. trachomatis have been reported, and these include number of sexual partners, previous history of sexually transmitted infections (STIs), socioeconomic factors, age at coitarche, irregular contraceptive use, previous PID, cohabitation, lifetime sex partner more than one, inconsistent use of condom, and recent change of partners.[10],[12],[13],[14]

The advent of polymerase chain reaction (PCR) has allowed for better estimation of the burden of the disease,[15] but these methods of diagnosis are neither cost-effective nor readily available in developing countries. Serodiagnosis is still useful, especially in developing countries where PCR is expensive and a positive serological test may be the only indication of chlamydial infection.[16] C. trachomatis immunoglobulin A (IgA) because of its half-life of 5–7 days and strong antigenic stimulation has now been suggested as a better marker of active infection. It has also been reported to be very useful in monitoring treatment response for active infection after treatment,[17],[18] while the presence of IgG is an indicator of chronic infection. Thus, the presence of IgG and IgA together has been suggested to be viewed as a better indicator of active chronic or persistent infection.[19],[20] Most gynecological morbidities associated with Chlamydia infection in women are due to the active chronic/persistent nature of the infection.[19],[20] Therefore, evaluation of the presence of IgA and IgG seromarkers and associated risk factors for C. trachomatis infection is a good starting point for interventions to reduce the burden of the infection. Thus, the aim of this study is to detect the prevalence of C. trachomatis infection using IgG and IgA seromarkers and also to determine the risk factors associated with it among gynecology clinic attendees in Babcock University Teaching Hospital.


  Materials and Methods Top


This was a cross-sectional, hospital-based study conducted among females presenting with various gynecology conditions between November 2017 and July 2018 at the Gynecologic Unit of the Babcock University Teaching Hospital, Ilisan-Remo, Ogun State of Nigeria. A total of 145 clinic attendees were randomly recruited for the study after filling the consent forms, and blood samples were collected for C. trachomatis seromarkers IgG and IgA. Pretested interviewer-based structured questionnaires were used to obtain the sexual history of women. Ethical approval was obtained from the Babcock University Ethical Review Committee before commencing the study. The exclusion criteria were females who were on antibiotics or who used antibiotics within the previous 6 months and also those who were not willing to provide consent, whereas the inclusion criteria were females within the reproductive age group attending the gynecology clinic and willing to give consent for the study. The samples were analyzed using the qualitative sandwich third-generation enzyme-linked immunosorbent assay (ELISA) that is type-specific for IgG and IgA against polypeptide derived from C. trachomatis major outer-membrane antigen (Diagnostic Bioprobes Milano, Italy). Statistical analysis was performed using standard descriptive and inferential statistical analysis from the Statistical Package for the Social Sciences, version 23.0 (IBM Inc., NYC, USA). Means and standard deviations were derived for quantitative variables, whereas proportions were derived for qualitative variables. Association between categorical variables was determined using the Chi-square test at statistical significance level set at 5%, while logistic regression was also performed as appropriate.


  Results Top


The data from the 145 respondents were complete for the analysis, and the overall prevalence of combined C. trachomatis infection was 46 (31.7%). The mean age of the respondents was 23.7 years (range = 15–45 years). Majority of the participants, 109 (75%), never used condoms, 83 (57.2) had one sex partner in the preceding 3 months, and 122 (84.1) have no history of STIs. Sociodemographic factors and sexual behaviors are further illustrated in [Table 1]. Factors that were associated with being positive for both C. trachomatis IgG and IgA on the bivariate analysis included the history of STIs and the number of lifetime sex partners [Table 2]. In multivariate analysis, only the number of lifetime sex partners was associated with C. trachomatis IgG and IgA (odds ratio = 5.63, confidence interval = 1.09–29.05, P = 0.039). Of the total patients that presented, majority of them 44 (30.3%) had PID, out of this, 14 (31.8%) were positive for C. trachomatis IgG and IgA, and they had the highest percentage of the seromarkers. /None of the clinical diagnosis of the participants was significantly associated with C. trachomatis IgG and IgA, as shown in [Table 3].
Table 1: Sociodemographic characteristics and sexual behaviors of respondents (n=145)

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Table 2: Factors associated with Chlamydia trachomatis infections (n=145)

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Table 3: The relationship between clinical diagnosis of participants and the seromarkers for Chlamydia trachomatis

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  Discussion Top


C. trachomatis is known to cause “silent'' infections, leading to various gynecological morbidities in women. Its chronic and persistent nature has been implicated as a reason for some of the morbidities.[19],[20] The statistically significant relationship between the number of lifetime sex partners and active chronic/persistent C. trachomatis infection implies that having more than one-lifetime sex partners increased the risk of having chronic or persistent Chlamydia infection. The reason for this risk might be because having more than one lifetime sex partners predisposes individuals to reinfection. In addition, there is an increased chance of having sex with an infected partner without knowing due to the asymptomatic nature of Chlamydia. This finding is in tandem with previous studies which have equally identified lifetime sex partners as being associated with chronic or persistent C. trachomatis infection.[21],[22]

In the index study, 12 (57.1%) of the 21 participants who had the past history of STIs were positive for the two seromarkers. Although prior history of STIs lost its significance on multivariate analysis, past reports in Nigeria by Wariso et al. in Port Harcourt and Mawak et al. in Jos have documented the association between C. trachomatis and history of STI.[23],[24] In Japan, Hatori et al. reported a significant association between C. trachomatis antibodies and history of the infection.[25] In India, Choudhry et al. reported that the presence of one STI increases the chance for another.[26]

Although condom use did not reach statistically significant level, our findings indicate a higher prevalence of Chlamydia trachomatis infection among those participants with either lack or inconsistent usage of condom. The lack of or an inconsistent use of condom might be one of the reasons why they were infected. While some other studies have found significant association between lack and inconsistent condom use and C. trachomatis,[21],[27],[28] some studies did not.[29],[30] The difference in the study population may be a reason for the observed variance.

The seroprevalence of Chlamydia antibodies was the highest among the participants' age 15–20 years and the second highest was among 20–25 years. This result is at variance with the finding in another study in Enugu, Nigeria, in which the highest antibodies level was found in the age group of 20–24 years.[31] Both age groups are classified as girls and young women, and studies have reported that the prevalence of genital C. trachomatis infection is higher among them.[32] Reasons proffered included age at first sexual intercourse, increased likelihood of unprotected sex, and increased sexual activities.[33] This might explain the reason why participants in this age group have the higher percentage of C. trachomatis IgG and IgA.

In this study, the combined prevalence of C. trachomatis IgG and IgA was 46 (31.7%). This is at variance with the prevalence of 80.8% reported in Japan by Teruko and 80% by Morré et al.[34],[35] The reason for this variance is not clear; however, different study population, diagnostic tools, and statistical analytical method may attribute to the variance. The high prevalence suggests a high rate of active Chlamydia infection, which makes sex partners and newborn at risk of being infected.

Of the 44 participants who presented with PID, 14 (31.8%) were positive for C. trachomatis IgG and IgA. This finding is similar to a study in Enugu, Nigeria.[30] Chronic and persistent Chlamydia infection will result in PID, which is a known preventable cause of chronic pain, infertility, and adverse pregnancy outcomes.[23],[36]

Limitation of the study

This study is not without a limitation as C-reactive protein, which is also a marker of active persistent infection,[20] and quantitative ELISA were not used.

Recommendation

Considering the gynecology morbidity caused by active chronic and persistent Chlamydia infection, screening of women of reproductive age group is advocated by the use of both C. trachomatis IgA and IgG unlike IgM which is acute-phase antibody that is not produced in persistent or recurrent infection.[37]


  Conclusion Top


There was a high prevalence of C. trachomatis IgA and IgG among the participants of the study, and lifetime sex partner was a significantly associated risk factor. Majority of those infected never used condom. Screening, sex education, and encouraging condom use may help to control and reduce the burden of the infection and its attendant sequelae.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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