Integrative Approach to Identify Environmental Risk Factors for CC-17 Group B Streptococcal Neonatal Infection
- Conditions
- Vaginal Colonization With GBS
- Interventions
- Biological: Bacteriological analyses on clinical samples performed with Eswabs
- Registration Number
- NCT02471937
- Lead Sponsor
- Assistance Publique - Hôpitaux de Paris
- Brief Summary
Streptococcus agalactiae (GBS) is the leading cause of neonatal septicaemia, meningitis, and pneumonia in the industrialized world. Early onset (EOD) and late onset (LOD) diseases are defined in neonates by their occurring within or after the first week of life, respectively. Molecular epidemiological studies have identified a capsular serotype III clone, referred to as CC-17 by Multi Locus Sequence Typing, as accounting for the vast majority of neonatal invasive diseases and for almost all cases of meningitis in LOD.
The investigators working hypothesis is that host-environmental interactions may contribute to the colonization and persistence of the hypervirulent CC-17 GBS in the neonate. In this project the investigators will determine if reciprocal interactions between the intestinal microbiota and the innate and adaptive immune system may specifically facilitate the colonization of the neonate by the hypervirulent GBS CC-17 clone.
- Detailed Description
Four specific tasks will be addressed to:
(i) Understand whether and how the gut microbiota may influence growth and colonization of GBS CC-17 within the intestine of neonates.
(ii) Study the contribution of different diets and immune system constituents enabling the persistence of GBS CC-17 in the gut of neonates.
(iii) Determine whether the adaptive immune response elicited by maternal GBS colonization and transmitted to the infant is different for GBS CC-17 versus non-CC-17 GBS.
(iv) Determine whether or not GBS strains isolated from the mothers and from their babies are identical and whether the environment (ie. the vagina or the milk for the mother, the intestine or the oral cavity for the baby) influence the expression of specific virulence factors of CC-17.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Female
- Target Recruitment
- 151
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Pregnant women negative for GBS colonization Bacteriological analyses on clinical samples performed with Eswabs Only women negative for GBS during all the study will be included.
- Primary Outcome Measures
Name Time Method Number of Negative GBS screening in vaginal samples 2 months
- Secondary Outcome Measures
Name Time Method Number of Negative GBS screening in fecal samples . at birth Number of Negative GBS screening in vaginal samples At delivery
Trial Locations
- Locations (1)
CH Louis Mourier
🇫🇷Colombes, France