Congenital Transmission of Lineages I and II of Trypanosoma Cruzi

Study Overview
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Brief Summary
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T. cruzi has been divided into two main lineages: T. cruzi I (TcI) and T. cruzi II (TcII, including all non-TcI). TcI is predominant in Mexico and Central America, while TcII (non-TcI) is predominant in most of South America, including Argentina. In recent studies from Argentina, the risk of congenital transmission has been estimated to vary between 2.6 percent and 7.9 percent. By contrast, we know very little about the congenital transmission of TcI. It has been suggested that congenital transmission of T. cruzi is strain related, and there is an urgent need to know if TcI transmits differently than TcII (non-TcI). Our primary hypothesis is that congenital transmission rates are different for TcI versus TcII. Our secondary hypothesis is that the characteristics of T. cruzi infected mothers (e.g., age, parity, transmission in previous pregnancies) and their exposure to vectors are different in regions where TcI is predominant versus regions where TcII (non-TcI) is predominant. To test these hypotheses, we propose to conduct a prospective study to enroll at delivery 13,000 women in Mexico, 7,500 women in Honduras, and 10,000 women in Argentina. We will measure transmitted maternal T. cruzi antibodies in cord blood, and, if the results are positive, we will identify infants who are congenitally infected by performing parasitological examinations on cord blood and at 4-8 weeks, and serological follow-up at 10 months. We will also perform standard PCR, real-time quantitative PCR, and T. cruzi genotyping on maternal blood, standard PCR and T. cruzi genotyping on the cord blood of congenitally infected newborns, and serological examinations on siblings. We will estimate the exposure to vectors in the household. In addition, we will measure prenatal outcomes among infected and uninfected infants with seropositive mothers, and the birth weight of their siblings. The specific aims of this study are: 1) To determine the rate of congenital transmission of TcI compared to TcII (non-TcI); 2) To compare the T. cruzi infected mothers' characteristics and exposure to vectors in regions where TcI is predominant and regions where TcII (non-TcI) is predominant; and 3) To describe the birth outcomes of infected and uninfected infants born to TcI and TcII seropositive women.

Official Title
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Congenital Transmission of Lineages I and II of Trypanosoma Cruzi

Conditions
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Chagas Disease

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Women 18 years old or more, informed consent, live birth. Exclusion Criteria: Women residing outside of the follow-up area.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| TcI, TcII<br>TcI: T. cruzi seropositive mothers from countries where TcI predominates, or/and with TcI genotyping TcII: T. cruzi seropositive mothers from countries where TcII (non-TcI) predominates, or/and with TcII (non-TcI) genotyping | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Congenital transmission of Trypanosoma cruzi | We will identify infants who are congenitally infected by performing parasitological examinations on cord blood, on venous blood at 4-8 weeks, and serological follow-up at 10 months. Standard PCR, quantitative real-time PCR (qPCR), and T. cruzi genotyping will be performed on maternal blood and cord blood. | Two years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Birth outcomes | Perinatal outcomes (premature rupture of the membranes, birthweight, gestational age, IUGR, and neonatal complications) will be measured among infected and uninfected infants with seropositive mothers, and birthweight will be measured among infected and uninfected siblings. | Two years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Congenital transmission, Trypanosoma cruzi, Chagas disease