Prevention of Diseases Induced by Chlamydia Trachomatis

Study Overview
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Brief Summary
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The main objective of the study is to determine whether early screening and treating young women (<25 years of age) for genital Chlamydia Trachomatis (Ct) infection reduces the cumulative incidence of pelvic inflammatory disease (PID) over 24 months. As secondary objectives, the study aims To determine the baseline prevalence and the incidence of Ct infection; To improve knowledge on natural history of Ct infection in young women such as the rate and timing of progression to PID (at the beginning of the infection, at the end, throughout the course of infection), as well as the incidence of reinfections with Ct; To investigate the relation between host immuno-genetic factors and the clearance, persistence and development of late complications (PID) as an explanation for the inter-individual heterogeneity in the susceptibility to and course of Ct infection.

Detailed Description
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In this research project, the study aims to assess a screening strategy (early screening and treatment of Ct genital infection in young women to prevent complications) that may be implemented in the future if proved efficient 7 centers are involved in the enrollment (university health services), and 4 centers will participate in the study within the frame of the follow-up and final visit (hospital gynaecology departments). Participants included will have to perform 4 self-taken vaginal samples linked to four online corresponding questionnaires, at different timeframes 6-month apart to each other (M0, M6, M12, M18). The first sampling (M0) will be performed at the university health service, this self-taken sampling could also be performed at home later in case of menstruation; the others (M6, M12, M18) will be performed at home (or at the university if problem of sampling kits receiving at home). Participants will be randomly assigned to one of the two following arms: in the non-intervention arm, participants will follow current guidelines of Ct screening (i.e. opportunistic screening only in STI clinics for women aged less than 25 years old), and their samples will be tested for Ct at M18 by the NRC; in the intervention arm, analyses for Ct will be carried out immediately by the NRC. A final visit with a hospital gynecologist is planned for all participants between M18 and M24 and aims at providing an extensive clinical examination to seek for potential signs of pelvic inflammatory disease and to treat participants if needed. Based on all data collected on the electronic platform through questionnaires from the different visits, independent experts blinded on chlamydia status will assess PID status of all participants (no PID, probable PID, confirmed PID). The duration of enrollment is planned for 36 months. The duration of follow-up for each patient is 18 months to 24 months.

Official Title
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Prevention of Diseases Induced by Chlamydia Trachomatis

Conditions
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Genital Chlamydia Trachomatis Infection

Intervention / Treatment
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* Other: Testing for Ct infection immediately
* Other: Testing for Ct infection at the end of the study


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: female students visiting the preventive medical centers of universities or the Ct screening test centers who participate in the study; participate in or will participate in the i-Share cohort; aged between 18 to 24 years, had prior sexual relations, written informed consent signed, affiliated to the social security bodies. Exclusion Criteria: Known pregnancy.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 24 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Intervention group<br>Testing for Ct infection immediately Participants will perform self-taken vaginal samples. The positive results for Ct will be examined and treated and their partner will also be informed to do so. | Other: Testing for Ct infection immediately<br>* Self-taken vaginal samples will be immediately tested for Ct infection at the National Reference Centre (CNR) at University of Bordeaux, using a commercially available CE marketed real-time PCR assay.<br>|
| Experimental: Control group<br>Testing for Ct infection at the end of the study | Other: Testing for Ct infection at the end of the study<br>* Self-taken vaginal samples will be tested for Ct infection at the end of the study (M18).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cumulative incidence | Cumulative incidence of first PID | At 24 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence of first Ct infection | Incidence of first Ct infection for negative participants at baseline | Up to 24 months | 
| Duration of Ct infection |  | Up to 24 months | 
| Proportion of Ct infection progressing to PID |  | Up to 24 months | 
| Time of Ct infection progressing to PID |  | Up to 24 months | 
| Proportion of spontaneous resolution of Ct infections | Proportion of spontaneous resolution of Ct infections | Up to 24 months | 
| Incidence of reinfections | Incidence of reinfections | Up to 24 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Chlamydia trachomatis, Pelvic inflammatory disease