- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02215226
GBS Sero-correlate of Protection (V98_28OBTP)
Establishing a Sero-correlate of Protection Against Invasive Group B Streptococcus Disease in Newborns and Young Infants Aged <=90 Days
Study Overview
Status
Conditions
Detailed Description
Group B Streptococcus (GBS) is a leading cause of invasive disease during the neonatal period in developed and developing countries. The global incidence of disease is 0.53 per 1000 live births, though a substantially higher incidence has been reported from South Africa (3 per 1000 live births). Of the disease-causing serotypes, types Ia and III account for over 70% of invasive disease in young infants. The introduction of screening for maternal rectovaginal GBS colonization, with subsequent treatment of colonized women with intrapartum antibiotic prophylaxis (IAP) at delivery, has led to a >80% reduction in the incidence of disease in some settings (Schrag, 2012). However, the residual burden of early-onset disease (EOD) in countries which have implemented universal screening and IAP remains similar to the incidence of late-onset disease (LOD), which has not declined over time. The resources necessary to implement a screening and IAP program has limited the establishment of this intervention in other developed and most developing countries.
GBS capsular polysaccharide-protein conjugate vaccines (GBS-CV) aimed at the immunization of pregnant women, with protection of the newborn expected from trans-placental acquisition of the induced antibodies in utero have been developed.
There are a number of challenges to undertaking a large efficacy trial of GBS-CV aimed at licensure of this vaccine. Consequently, licensure of GBS-CV may depend on establishing an immunologic/serologic correlate of protection against invasive disease in newborns, as has been successfully motivated for and adopted in the licensure pathway of meningococcal vaccines. Although previous studies have aimed to identify serotype-specific correlates of anticapsular antibody protection against invasive GBS disease during early-infancy; differences in study-design, age-range of invasive-cases, antibody assay methods and a lack of standardized reference serum between tests mean a robust sero-correlate of protection against GBS has yet to be identified.
We propose to conduct a case control study nested within a prospective, longitudinal cohort of mothers and their infants <=90 days of age, at one academic hospital center in South Africa. The limited intrapartum antibiotic exposure (10-12% deliveries), relatively high incidence of both EOD and LOD (2 per 1000 live births and 1 per 1000 live births respectively) and standardized laboratory surveillance (for case identification) offers an optimal setting in which to establish correlates of protection against the GBS serotypes that predominate in this setting (serotypes Ia and III for EOD and serotype III for LOD).
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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Gauteng
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Soweto, Johannesburg, Gauteng, South Africa, 2013
- Respiratory and Meningeal Pathogen Research Unit
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- (i) Pregnant women attending participating community/hospital antenatal clinics and/or delivering at participating delivery centers.
(ii) Subjects aged ≥18 years. (iii) Able to understand and comply with planned study procedures. (iv) Provides written informed consent.
Exclusion Criteria:
- (i) Refuses to consent to study participation.
Study Plan
How is the study designed?
Design Details
- Observational Models: Case-Control
- Time Perspectives: Prospective
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Risk of early onset Group B Steptococcus disease (due to serotypes Ia or III) with respect to maternal or newborn anticapsular antibody levels at delivery.
Time Frame: Birth to 6 days of age
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Early onset Group B Streptococcus disease due to serotypes Ia & III
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Birth to 6 days of age
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Risk of late onset Group B Streptococcus disease (due to serotypes III) with respect to maternal or newborn anticapsular antibody levels at delivery
Time Frame: 7 to 90 days
|
Late onset Group B Streptococcus disease due to serotype III
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7 to 90 days
|
Collaborators and Investigators
Collaborators
Publications and helpful links
General Publications
- Madhi SA, Izu A, Kwatra G, Jones S, Dangor Z, Wadula J, Moultrie A, Adam Y, Pu W, Henry O, Briner C, Cutland CL. Association of Group B Streptococcus (GBS) Serum Serotype-Specific Anticapsular Immunoglobulin G Concentration and Risk Reduction for Invasive GBS Disease in South African Infants: An Observational Birth-Cohort, Matched Case-Control Study. Clin Infect Dis. 2021 Sep 7;73(5):e1170-e1180. doi: 10.1093/cid/ciaa1873.
- Jallow S, Agosti Y, Kgagudi P, Vandecar M, Cutland CL, Simoes EAF, Nunes MC, Suchard MS, Madhi SA. Impaired Transplacental Transfer of Respiratory Syncytial Virus-neutralizing Antibodies in Human Immunodeficiency Virus-infected Versus -uninfected Pregnant Women. Clin Infect Dis. 2019 Jun 18;69(1):151-154. doi: 10.1093/cid/ciy1071.
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- V98_28OBTP
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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