Anti-Schistosomiasis Vaccine: Sm14 Phase 2b-Sn in School Children
- Registration Number
- NCT03799510
- Lead Sponsor
- Oswaldo Cruz Foundation
- Brief Summary
The clinical trial phase 2b is designed to assess the safety and the specific immune response of the active ingredient (protein + adjuvant) in healthy and then in infected school children from 8 to 11 years of age with intestinal and/or urinary schistosomiasis, living in the Valley of the Senegal River, a highly endemic area for schistosomiasis.
- Detailed Description
A phase 2b trial, self-contained, open-label, controlled, randomized study in three parallel arms, two of them formed by groups of healthy or infected school children, both receiving three (3) injections at D0, W4 (Week 4), W8; both groups receiving 50 μg Sm14 vaccine candidate solution, combined with 2.5μg GLA-SE. The third group is composed by non-vaccinated infected school children.
Sm14: recombinant protein produced in yeast following Good Manufacturing Practices (GMP) conditions, presented in vials containing 0.55 ml solution Sm14, 0.4 ml solution is diluted with 0.4 ml of GLA (Synthetic Glucopyranosyl lipid A) for intramuscular administration.
Medical examinations are performed at D0 (before injection, 1 hr and 4 hr after), and a safety evaluation at 24 hrs and 48 hrs, after each injection.
Blood analysis: Liver function tests - renal function tests - blood counts, at W-1 before inclusion, and at W9 and W21 during the follow-up.
Blood samples for immune response analysis at D0, W12 and W21.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 95
- School children, of public schools in villages of Saint Louis region (Senegal), female or male, 8 to 11 years old (inclusive) at the time of inclusion.
- Residence in the area during the period of the study.
- Free of obvious/severe health problems except schistosomiasis, as established by clinical examination.
- Written informed consent to participate obtained from subject's parents or legal guardian.
- Free of obvious/severe health problems except schistosomiasis, established by blood analysis, i.e. hematological exams, liver and renal function tests.
- Treated with 40mg/kg Praziquantel (PZQ) before inclusion (W-2 to W-4 before the first injection) in case of infection with S. mansoni and S. haematobium
- Children of Group 1: not infected, no schistosomiasis history and living in area/village free of Sm and Sh transmission.
- Children Groups 2 & 3: infected with mansoni or/and haematobium schistosomiasis.
- School child who does not respond to one of the inclusion criteria
- Child under 20kg of body weight
- Vaccination within 90 days preceding the first dose of Sm14 vaccine candidate, or planned use during the study period.
- Current or previous chronic administration (defined as more than 14 days) of immunosuppressive drugs or other immuno-modifying drugs.
- Known hypersensitivity to any component in the Sm14 vaccine or history of allergic disease.
- Knowledge of non-infectious chronic disease
- Known acute disease.
- Other conditions which in opinion of the PI may potentially represent a danger for the patient to be enrolled.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Group 1 GLA-SE solution Healthy school children with no infectious history of Schistosomiasis receiving three (3) intramuscular injections of 50 μg Sm14 with 2.5 μg GLA-SE solution at D0, W4, W8 (D=day; W=week). Three-month follow-up (W12, W20). Group 2 GLA-SE solution School children with an infectious history of S. haematobium and-or S. mansoni and pretreated with 1 dose of Praziquantel (2-4 weeks prior to the first vaccine injection) receiving three (3) intramuscular injections of 50 μg Sm14 with 2.5 μg GLA-SE solution at D0, W4, W8 (D=day; W=week). Three-month follow-up (W12, W20). Group 1 Sm14 Healthy school children with no infectious history of Schistosomiasis receiving three (3) intramuscular injections of 50 μg Sm14 with 2.5 μg GLA-SE solution at D0, W4, W8 (D=day; W=week). Three-month follow-up (W12, W20). Group 2 Sm14 School children with an infectious history of S. haematobium and-or S. mansoni and pretreated with 1 dose of Praziquantel (2-4 weeks prior to the first vaccine injection) receiving three (3) intramuscular injections of 50 μg Sm14 with 2.5 μg GLA-SE solution at D0, W4, W8 (D=day; W=week). Three-month follow-up (W12, W20).
- Primary Outcome Measures
Name Time Method Number of Participants with Adverse Events as a Measure of Safety and Tolerability Day 150: five months after the first injection (Week 21) Local signs and symptoms included pain or tenderness, swelling, induration and erythema at the site of injection.
Complete physical examination including an examination of general appearance, body weight and forehead temperature, head, eyes, ears, nose and throat, neck, skin, cardiovascular and respiratory system, abdominal system, nervous system, lymphatic area, blood pressure, pulse and respiratory rates. General signs and symptoms including fever, headache, nausea, vomiting, myalgia, arthralgia, irritability/fussiness and drowsiness, loss of appetite and sleep disturbances.
- Secondary Outcome Measures
Name Time Method Qualitative and quantitative assessment of the Immunogenicity At the 90th day after the third Sm14 vaccine administration (Week 21) Immunogenicity was evaluated by Isotype analysis of the antibodies produced specifically against the rSm14 andvaccine-induced (ELISA) and Specific rSm14 cellular response (on PBMC), production of intracellular cytokines (PBMCs stimulation and cytokine dosing). Cellular immune responses measured by PBMC luminex assay for T-cell cytokines (Milliplex ® MAP kit).
Correlation between the development and magnitude of humoral responses measured by antibody IgG production to the Sm14 Schisto protein using enzyme-linked immunosorbent assay (ELISA).
Trial Locations
- Locations (1)
Biomedical Research Center EPLS
🇸🇳Saint Louis, Senegal